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Assessing Effectiveness of Multipurpose Voucher Scheme to Enhance Contraceptive Choices, Equity, and Child Immunization Coverage: Results of an Interventional Study from Pakistan

Background Pakistan has a high total fertility and unmet contraceptive need and is the fifth most populous country. This research aims to assess the effectiveness of a subsidized, multi-purpose voucher intervention to enhance the client–provider interaction for improved contraceptive counseling resulting in a potential increase in the modern methods uptake, continued use, and its impact on equity through better targeting, while increasing uptake of postnatal care and child immunization among women from the lowest two wealth quintiles in rural and urban communities of Punjab province, Pakistan. Methods We used a quasi-experimental design with pre- and post-phases in intervention and control sites in Punjab province (August 2012–March 2015). To detect a 20% increase in modern contraceptive prevalence rate compared to baseline, 1276 women were enrolled in each arm. Difference-in-differences (DID) estimates are reported for key variables. Absolute and relative index of inequality including concentration curves and concentration index are used to describe the magnitude and extent of equity. Results With no net increase in modern contraception use, the intervention area, however, reported a low modern method discontinuation rate. Vaccination rates for BCG increased significantly by 14%, and 5% each for DPT, HBV, and measles. Concentration index and slope index of inequalities for first-time use of modern contraceptives, knowledge of contraceptives, receiving ANC, and delivery at health facilities were negative, indicating that the use of these services was more concentrated among the disadvantaged in intervention areas than the wealthy counterparts. Conclusion This Greenstar-led multiple voucher model did not significantly increase modern contraceptive use in the intervention study area but positively impacted equity. The integrated approach combining contraception with child immunization led to an increase in immunization coverage. It will be important for public policy decision-makers to assess the usefulness of this approach, as a long-term provision of free contraceptive services may lead to dependency in targeted communities.


Introduction
Unintended pregnancies, resulting from an unmet need for contraception, threaten the lives and wellbeing of women and their families globally. 1 Contraceptives are one of the most cost-effective investments a country can make for its future. 2 Contraception offers a range of potential benefits that encompass economic development, maternal and child health, education, and women's empowerment. In some developing countries, increased contraceptive use has already cut the annual number of maternal deaths by 40% over the past 20 years, and reduced the maternal mortality ratio (the number of maternal deaths per 100 000 live births) by about 26% in little more than a decade. 3 According to 2017 estimates, 214 million women of reproductive age in developing regions have an unmet need for family planning. 4 It is highest among the most vulnerable in society: adolescents, the poor, those living in rural areas and urban slums, people living with HIV, and internally displaced people. 1 To accelerate progress towards attainment of international development goals and targets in sexual and reproductive health, and to contribute to meeting unmet needs for contraceptive information and services, contraceptive services should be available, accessible, acceptable, and of good quality, and provided without discrimination. 1 Inequitable access in family planning services continues to be a challenge. [4][5][6] The World Health Organization identifies research on intervention mechanisms that helps promote contraceptives uptake as a priority. 7,8 Vouchers have emerged as an effective strategy to combat inequities in increasing access to and use of modern contraceptive services and have also been used broadly in sexual and reproductive health interventions, 9,10 especially for special populations including the poor, youth, and postpartum women. [11][12][13] Pakistan has a high population growth rate and, as per the latest 2017 Census, Pakistan's current population is 207.8 million. By 2030, it is expected to rise to a projected 350 million. The PDHS 2017-18 indicates that the current fertility rate in Pakistan is 3.6 children per woman, and that the modern Contraceptive Prevalence Rate (mCPR) is around 25% and the unmet need for Family Planning is 17%. 14 In Pakistan, some studies were conducted using a combination of social franchising and vouchers in maternal health and family planning with mixed results. [15][16][17] This study aims to assess the effectiveness of a multipurpose voucher approach vs the control in increasing the uptake of modern contraceptives, postnatal care, and child immunization; and understanding its impact on equity by studying women from the lowest two wealth quintiles in underserved communities of the intervention district (Faisalabad) and control district (Toba Tek Singh) in Punjab, Pakistan.

Methods
This was a quasi-experimental study with pre, and post phases implemented across intervention (Faisalabad) and control arm (Toba Tek Singh) districts. These districts were selected based on comparable socio-demographic and health indicators (Table 1). 18 For the pre-intervention phase an independent baseline survey was conducted in August 2012 to provide information on the prevalence of key project indicators in the intervention and control districts. 19,20 The intervention ended in March 2015. In the post-intervention phase, we conducted an independent end line cross-sectional household survey in the intervention and control districts in March 2015. (Table 2)

Study Interventions
Based on the study design, 20 Greenstar Social Marketing (GSM)/Population Services International (PSI) project employed a low-priced multi-purpose voucher scheme in the intervention areas, assuming that it is the lack of awareness due to poor counseling (not affordability) leading to, no-or low-utilization of modern contraceptive services. This intervention focused to enhance the clientprovider interaction with improved FP counseling. The salient features of the intervention were the following: • The GSM/PSI intervention comprised a booklet of vouchers that pre-paid 13 visits to service providers over an 18-month period. • The vouchers catered for two postnatal care (PNC) visits (services and counseling), five child immunizations (services and counselling) and six family planning visits (only FP counseling included, the client paid for the preferred product). • The cost of the complete voucher booklet was 50 Pakistan rupees (US$ 1=98.7 Pakistan rupees). • The vouchers were distributed through service providers and distributing agencies to eligible poor women (the service providers and the field workers of the distributing agencies screened potential clients asking questions on modern contraceptive access, useever/current and availability). • The providers were trained on inter-personal communication and behavior change communication to provide contraceptives and maternal/child health awareness to the potential clients. • Poverty was defined as those women who belonged to the poorest two quintiles using a poverty assessment tool.
It was assumed that the multi-purpose voucher approach, if effective, could help in enhancing more interactions between clients and providers leading to increased contraceptive service uptake as well as simultaneously achieving other maternal and child health goals, especially child immunization.

Study Participants
Clients for vouchers, ie, married women of reproductive age (MWRA) aged between 18-49 years from the lowest two wealth quintiles (including, but not limited to, recently delivered/post-partum women), were identified by providers, who  were part of the GSM provider network, in the intervention district using the poverty assessment tool. Vouchers were distributed to eligible women who were in the lowest two wealth quintiles on the poverty scale. The voucher could be redeemed for services by the project provider, with reimbursement being sent to the provider later.

Sampling
The sample size was calculated assuming that the modern method CPR would increase by up to 20 percentage points from the baseline to the end line in the intervention area and that, in the control area, it would increase by 5 percentage-points between baseline and end line. Using PASS 11 ® software, it was estimated that group sample sizes of at least 1276 for the intervention arm and 1276 for the control arm would produce a two-sided 95% confidence interval for the difference in population proportions with a width of 5% when the estimated sample proportion "1" is 20%, and the estimated sample proportion "2" is 5%, and the difference in sample proportions is 15%.
To recruit a sufficient number of voucher clients to ascertain if vouchers could successfully target the lowest two quintile clients, we used stratified sampling in the intervention district (Faisalabad). The sample size estimated was at least 360 voucher clients. We therefore used stratified sampling by recruiting respondents from the general population (strata 1) and voucher clients (strata 2). To ensure we recruited at least 360 voucher clients we allocated the required sample size for Faisalabad (intervention) district in two strata in a 3.5:1 (general population: voucher client) ratio whereby an oversampling of voucher clients was necessitated. Data were analysed using weighted analysis accounting for oversampling of voucher clients in the intervention arm. The final sample size, therefore, was at least 916 respondents from the general population (strata 1) and 360 voucher clients (strata 2) in the intervention arm.

Sampling Procedure
A multi-stage sampling strategy was used to recruit study participants for the end line household (HH) survey. At first stage a sampling frame of Union Councils (UC) in each district was prepared. Each UC was considered a cluster for the end line HH survey. In Faisalabad (intervention) area the total number of UCs obtained was 289 while in Toba Tek Singh (control) the total number of UCs was 84.
Using simple random sampling (SRS) 46 UCs from the Faisalabad (intervention) were selected as a sampling frame, and sampling was stratified to recruit at least 916 respondents from the general population. For 360 voucher clients we first selected 19 GSM providers using SRS from the 100 GSM participating providers. For each selected provider we again selected 21 voucher clients from the available sampling frame of voucher clients for each provider using SRS. At the second stage we selected a HH using systematic sampling methods. For HHs with more than one eligible respondent, only one eligible woman was selected for interview. In control we selected 60 UCs (clusters) using SRS. Since the required sample size for control was 1276, this ensured that we recruited at least 20 respondents per cluster. Within the UC the HH survey was conducted, using similar methods as in Faisalabad district ( Figure 1).

Instrument
A structured questionnaire was used that covered demographics, reproductive status, decision-making and contraceptive status, quality of FP services, and poverty assessment. The questionnaire was translated from English into Urdu (national language of Pakistan) back-translated and pre-tested (Table 3).

Data Management
Data collected during household surveys were double entered in a pre-designed software by two separate data operators. Measures were taken to ensure the quality of collected data. All forms were checked daily for completeness, logical errors, and cleared of irrelevant responses. Monitoring visits were also made by the PI, co-investigators, and project head office team to ensure the quality of data and adherence to the study protocol. Refresher training was arranged to emphasize understanding of data-collection tools. The software developed for data entry was also restricted for mandatory fields and extreme values. Hard copies of completed tools (questionnaires, checklists, reporting formats) were kept in locked storage before and after data entry.

Data Analysis
Data were analysed using descriptive, inferential, and regression statistics. Chi-square and t-test were used to compare sample characteristics between intervention and control arms to assess the differences in categorical and continuous variables, respectively. For descriptive analysis we compared the differences between baseline and end line for important project indicators. This was done for intervention and control districts separately. Chi-square was performed for variables that had sufficient cell count (>5) in each category being tested. t-test was conducted to assess the differences in continuous variables. Analysis was weighted to account for the effect of oversampling of voucher clients in intervention districts. Inferential statistics focused on isolating the effect of the intervention. Univariate Difference-in-differences (DID) estimates are reported for key contraceptive use variables. DID analysis was done by calculating 1) the change in indicators (from baseline to end line) in the control arm, 2) change in indicators (from baseline to end line) in the intervention arm, and 3) net effect of intervention by subtracting the observed change in the control arm from the observed change in the intervention arm.

Health Equity Analysis
Household wealth index scores were used for the equity analysis. Asset-based wealth indices were derived from principal component analysis. Subsequently, the scores were divided into quintiles with quintile 1 (Q1) indicating the poorest 20% of households and quintile 5 (Q5) representing the richest. We used one absolute (the slope index of inequality (SII)) 21,22 and two relative measures (the ratio of Q5 to Q1, and the concentration index) to assess the extent and degree of inequalities. As absolute and relative measures can produce different results that may lead to different conclusions, both measures were essential in order to get a clear picture of inequalities. The SII was calculated with logistic regression rather than with the traditional linear regression approach to avoid predicting values in the regression model that were outside the interval between 0 and 1. The SII uses the coverage values in the difference in percentage points between individuals at the top and bottom of the wealth scale. SII was determined/worked out by regressing all/each of the seven outcomes against an individual's relative rank in the cumulative distribution of socioeconomic position.

Concentration Curve
In order to assess differences in horizontal equity among voucher clients and the general population of MWRA, a concentration index and curves were generated. The Sample size estimation for endline survey Voucher clients n~360 General MWRA n~916 Bhakkar (Control) n~1276  concentration curve was drawn to display the degree of inequality by plotting the cumulative proportion of modern contraceptive method use on the Y-axis against the cumulative proportion of population on the X-axis, ranked from poorest to richest. The line of equality or the 45-degree line means an equitable distribution of modern contraceptive use among the study population, irrespective of household socioeconomic status. If the concentration curve lies above the line of equality, it indicates a pro-poor utilization of modern contraceptive methods with the population. If the concentration curve lies below the line of equality, it indicates a pro-rich utilization of modern contraceptive methods. The distance between any concentration curve and the line of equality indicates the degree of inequality, with the uppermost (lower most) concentration curve showing the most pro-poor (pro-rich) distribution.

Concentration Index
The concentration index is also another measure that indicates the magnitude of inequality. 23 The index indicates the extent to which a health or services indicator is concentrated among the disadvantaged or the advantaged. This index is directly related to the concentration curve and is defined as the area between the concentration curve and the 45-degree line (line of equality). We estimated the concentration index for voucher clients and non-voucher clients to determine equality in the use of modern contraceptive method. This index indicates the extent to which a health or services indicator is concentrated among the disadvantaged or the advantaged. The concentration index gives values ranging from −1 to 1. When the concentration index value is 0 it indicates there is no inequality -ie, access to health services (utilization of modern contraceptive methods) makes no difference among poor and rich population. The negative value indicates a relatively higher utilization of modern contraceptive use among the poor. A positive value of the index indicates a comparatively higher utilization of contraceptive method among the advanced or better off population. All analyses at both the univariate and multiple regression stages were adjusted for the probability sample weights. Statistical analyses were performed using Stata version 13.1 Software (StataCorp, College Station, TX, USA).

Ethics Approval and Consent to Participate
All respondents were informed about the survey and their rights. No personal information was entered in the database that could be used to identify specific individuals. The study protocol was reviewed and approved by Population Services International (PSI) Research Ethics Board (REB). 19,20 All survey participants provided written informed consent.

Results
We report the key findings of the study.

Demographic Characteristics
Marital Status and Age Structure All study participants were married women. The age distribution indicates an increase of 4 years in intervention (baseline: 27 years, end line: 31 years) and in the control areas (baseline: 28 years, end line: 32 years). The average household showed a reduction in size from 7.8 to 6.7 and 8.1 to 6.3 persons per household in intervention and control areas, respectively. The majority language spoken in both intervention and in control areas was Punjabi ( Table 2).

Contraceptive Uptake and Knowledge Current Contraceptive Use
Current contraceptive uptake increased significantly in intervention areas by 23%, ie, from 24% at baseline to 47% at end line. In the control group women reported a significant increase of 18% in current contraceptive uptake, from 23% at baseline to 41% at end line. Among current users, modern contraceptive method use increased significantly by 15% (baseline: 18%, endline: 33%) in the intervention area. A similar significant increase of 15% is observed in the control area also (baseline: 17%, endline: 32%). The method mix in Table 4 provides a breakdown of specific method current contraceptive use. In the intervention area, the most significant increase was noted in female sterilization, which increased by 11% (from 5% to 16%) in the intervention group, and for withdrawal usage, which increased by 5% (baseline: 6%, end line: 11%) followed by a 3% increase in IUD use (baseline: 2%, end line: 5%). In the control area, female sterilization use increased by 10 percentage points, ie, from 4% at baseline to 14% at end line. Female sterilization, IUDs, and injections also increased at end line (Table 4).

Overall Ever Use of Contraceptive Methods
Ever use of contraception increased in both intervention and control areas. In intervention areas there was a significant increase of 25% (baseline: 40%, end line:

Contraceptive Information
Overall information of at least one contraceptive method increased in intervention areas by 5% (baseline: 92%, end line: 97%, P 0.45) and in control areas by 3% (baseline: 92%, end line: 95%, P 0.79). In intervention and control areas at both base and end lines, the most common known contraceptive method was pills and injections.

Method Discontinuation and Switching
At end line, participants were asked about use, discontinuation, and switching of any modern contraceptive method during the last 2 years. In the intervention district, 722 (55%) women reported using a modern contraceptive method during the last 24 months. Of these, 16% reported discontinuing modern contraceptive use while 3% had switched to a modern contraceptive during the same time.
In the control district, 504 (38%) women reported using a modern contraceptive method during the last 24 months. Women discontinuing modern contraceptive use in the control areas were four percentage points greater at 20%, while only 2% of women had switched to a modern method during the last 2 years, compared to the intervention area.
The difference was not found to be significant (P 0.07). Women in the intervention and control areas mainly discontinued due to a desire for more children (intervention: 53%, control: 51%), and pregnancy due to method failure (intervention areas 6%, control areas 13%) ( Table 5).
Women who reported switching to a modern method during the past 24 months were also asked about which method they switched to. The two most common methods women switched to were condoms (30%) and IUD (30%) in intervention areas, while women in control areas most commonly switched to condoms (50%) followed by pills (25%).

Immunization Coverage Vaccines Received
Difference in difference analysis shows that the intervention area did not record a significant increase in vaccination for ever vaccinated children (Table 6). For individual vaccines, the intervention area coverage increased for BCG (84% to 91%), DPT (78% to 84%), HBV (52% to 82%), and measles (42% to 79%) vaccines between baseline and end line. The increase for HBV and measles vaccines was significant.

Targeting Voucher Clients
Distribution of voucher clients according to poverty assessment (based on a poverty assessment tool) indicates that 40% (n=409) of the voucher clients fulfilled the poverty assessment criteria. FP visit was the main (86%) service used by voucher clients through the voucher scheme, followed by immunization visits (54%). The main FP method used by voucher clients was IUD (39%), followed by injections (29%), condoms (18%), and pills (12%). Furthermore, the satisfaction of voucher clients with respect to attributes of service quality (figures not shown here) was highest for friendliness and respect received from providers and at the health facilities. Cleanliness and length of time spent waiting to be seen at the facility were the least satisfactory.

Difference in Difference Analysis
Despite increases in both intervention and control sites, there was no net increase in modern contraceptive use among the study participants. Current use and ever use of modern contraceptives increased significantly by net 5% and 8%, respectively. Method-specific net increases were noted for condoms (4%) and female sterilization (1%) ( Table 7).

Vouchers and Modern Contraceptive Use
Modern contraceptive method use in the intervention group among voucher recipients and the general population is shown in Figure 2. Bivariate analysis (left panel) indicated that around 84% of voucher clients used modern methods, whereas 34% MWRA in the general population used modern methods (P<0.001). Univariate model (unadjusted) found significantly higher odds ratio (OR=10.2; 95% CI=7.5-13.7) of modern contraceptive use for voucher clients compared to MWRA from the general population. The multivariable logistic regression analysis (right panel) showed that voucher clients were 14.2 (95% CI=10. 1-19.8) times more likely to use modern contraceptives compared to the general population ( Figure 3). Table 8 presents the use of contraceptive methods and maternal health services by women in the poorest and the richest quintile, based on baseline and endline data. The table also includes the summary equity indices and shows the results of inequality in contraceptive use and maternal health services in Greenstar Project areas. Both absolute and relative inequality measures are also presented.

Health Equity Analysis: Differences in Contraceptive and Maternal Health-Care Uptake by Wealth Index
The percentage difference (SII) of contraceptive ever use from poorest-to-richest was 3% in the intervention group, indicating that women in the richest quintile were 3% more likely to ever use a contraceptive ( Table 8).
The poorest-richest difference (SII) for current contraceptive use was −0.9% in intervention areas, followed by −0.1% for modern method use, −2.3% for first-time modern-method use, −1.3% for knowledge of contraceptives, −15% for receiving ANC and −16% for delivery at a health facility. These negative findings suggest that women in the richest quintiles were less likely to be associated with the above outcomes compared to women in the poorest quintile (Table 8).
Concentration index values for modern contraceptive use, first-time use of modern contraceptives, knowledge of contraceptives, receiving ANC, and delivery at health facilities were negative in intervention areas, indicating that the use of these services was more concentrated among the disadvantaged (poor) in intervention areas (Table 8).   voucher clients and general population MWRA according to wealth status in the Greenstar intervention group. Visually comparing the two curves, an increase in inequality can be seen if the curve shifts further from the line of equity. The concentration curve of voucher clients is very close (and just above) the line of equity, indicating a higher concentration of modern contraceptive use among poor women compared to women from the richer wealth status. The voucher client concentration curve approached the line of equality, suggesting that there was very low inequality and in terms of access to modern contraceptives there is equality between rich and poor among voucher clients. The concentration indexes confirm what was observed in the curves. The concentration index of voucher clients had a negative value close to zero (−0.029, 95% CI= −0.054-0.005; P=0.02) indicating that a greater proportion of the population with a lower wealth status uses modern contraceptive methods than those with a higher wealth status. The concentration curve for the general population is less clear-cut; 50% of the curve is below the diagonal line, with the remainder above it. However, the concentration index is negative and close to zero (−0.006, 95% CI= −0.058-0.0464; P=0.82), indicating that the use of modern contraceptive methods was pro-poor, and that the poor-torich difference is minimal in access to modern contraceptive methods.

Discussion
Several important findings emerge from our analysis. Firstly, the results indicated that targeted provision of subsidized FP services through a multi-purpose voucher scheme was not effective enough to have a net increase in demand and use of modern contraceptives in an intervention area compared to the control area.
However, the overall current use of contraceptives did increase significantly from baseline in intervention areas by 23% compared to the control group at 18% in current contraceptive use at the endline. There was a net increase of 5% in any contraceptive method use by women in the intervention arm. To note, this was primarily driven by traditional method use and was not the main outcome of interest for this study.
A possible explanation can be that, compared to baseline, results in the end line survey noted that most women obtained contraceptive methods from public sector providers working under the umbrella of population welfare and health departments. All these programs have family planning and immunization provision in their scope of work. However, triangulating the exact attribute to the gains in the control group was not possible as that would have required additional field operations with intensive requirements for financial, time, and human resource. There is the possibility that, during the course of the project, the services at public sector outlets improved in the control areas of the project, nullifying the gain in modern contraceptive uptake in the intervention  arm of the project. This is an area that needs to be explored further by program managers of the GSM Project.

Discontinuation and Switching
The intervention had some effect in reducing modern method discontinuation in the 2 years preceding the survey. The performance of the intervention area to enhance continuous use of modern contraceptives is an encouraging sign and has the potential to be used as a launching pad for future FP service provision.

Targeting the Underserved
The result noted that only 40% of the women who received vouchers belonged to the two lowest socioeconomic quintiles. This can be explained by the fact that some women, in addition to eligibility criteria for poverty, might have received vouchers based on need for capacity-to-benefit (defined as a woman is given a free service voucher if she reports lack of access to finances, irrespective of what her poverty-ranking score is) 24 to enhance social empowerment. Furthermore, a study stated that "need only exists if there is capacity to benefit from a health-care service". 25 This highlights the outcomes to be achieved by allocating resources on the basis of need that also promotes efficiency by directing attention to interventions that produce the most benefit. 26 Besides using poverty assessment criteria, it is important to carefully consider options that can maximally benefit the lowest quintile such as regional or geographical targeting for future FP financing initiative.

Equity in Contraceptive Use
In this intervention, both slope index of inequality and concentration index for modern contraceptive use, firsttime use of modern contraceptives, knowledge of contraceptives, receiving ANC and delivery at health facilities were negative in intervention areas. This finding shows that these indicators were concentrated among the disadvantaged women (poor quintiles) in intervention areas. The concentration curve of voucher clients was observed to be very close to the line of equity, suggesting equality in terms of access to modern contraceptives between rich and poor women. Therefore, the health equity analysis findings demonstrate the effectiveness of the intervention in improving contraceptive ever use, current contraceptive use, modern  contraceptive use, and first-time modern contraceptive use among the most deserving segments of the population. Disparity in the distribution of vouchers to potential clients in terms of poverty assessment might be one of the reasons for the lack of effectiveness of project interventions on some contraceptive uptake outcomes in the project.

Policy Implications
In the past decade, voucher programs have increasingly been implemented to channel subsidies from governments and donors to disadvantaged populations in order to stimulate demand for specific health services by subsidizing access via accredited and contracted healthcare facilities and providers. In many Lower-Middle Income Countries (LMICs), uptake of short-term modern contraceptives such as the condom or the pill, has substantially increased in response to FP program initiatives, usually with one or two methods dominating the method mix. But significant inequities and disparities remain, particularly to access highly effective long-acting reversible contraception (LARC) and permanent contraception. Although initial financial costs to obtaining these methods are higher, the cost per month over the long term is often lower than less-effective, shortterm methods. These long-term methods are, however, often out of reach of the most vulnerable and marginalized women. In developing countries, in order to bridge this equity gap, national governments, donors, and NGOs are collaborating to expand access to modern contraceptives, particularly LARCs, by testing and implementing strategies aimed at increasing affordability both on the demand and supply side.
In the efforts to enhance method mix, GSM voucher intervention had a positive impact on key contraceptives indicators in intervention areas. While the GSM voucher model did not demonstrate a substantial net gain in modern contraceptive use, it was effective in increasing any and first-time contraceptive uptake among disadvantaged segments of the population in the intervention areas. This model also used a subsidized approach rather than providing free services, it will be important for decision-makers to evaluate the usefulness of this approach, as long-term provision of free services can lead to dependency in targeted communities.
Poor women living in intervention sites were more likely to have higher uptake of child immunization and contraceptives methods than in sites not served by the voucher program and it seems a promising approach which requires further implementation experience and impact documentation. 27 Voucher programs have their strengths; they are a proven approach to increasing the use of priority services, 28 improve equity, have a positive impact on the quality of services, 29 and can lead to a higher rate of continuation of modern methods. Vouchers are a promising mechanism to reach out to the poor and underserved in countries where social health insurance is not yet feasible. Vouchers are a promising approach to target subsidies to individuals who, in the absence of the subsidy, are less likely to have sought care, thus enhancing equity. However, any scheme introduced in the public sector will depend on the quality of service provision (counseling, commodity provision) and monitoring to ensure the standards in services in the public sector.

Conclusion
Although this low-cost multipurpose voucher model was not able to demonstrate an increase in net modern contraceptive use through the private sector, some gains were noted, such as an increase in method-specific contraceptive use, better child immunization status, and a positive impact on equity. Policy-makers may review and adapt the available approaches in local context to effectively reach the underserved and deserving in increasing contraceptive services to achieve national goals.

Disclaimer
This paper contains the collective views of an international group of experts, and does not necessarily represent the decisions or the stated policy of the World Health Organization.

Abbreviations
DID, Difference-in-differences; FP, family planning; GSM, Greenstar Social Marketing; HH, household; LMIC, lower-middle income countries; MCH, maternal child health; mCPR, modern contraceptive prevalence rate; MWRA, married women of reproductive age; PNC, postnatal care; PSI, Population Services International; SRS, simple random sampling; SII, slope index of inequality; UC, Union Council; WHO, World Health Organization.

Data Sharing Statement
The data will be available on request from the corresponding author.

Ethics Approval and Consent to Participate
This paper reviewed national policies. The data were completely anonymous with no personal identifiers. The study was reviewed and approved by Population Services International (PSI) Research Ethics Board (REB). 19,20

Consent for Publication
Not applicable.