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Measuring Men’s Gender Norm Beliefs Related to Contraception: Development of the Masculine Norms and Family Planning Acceptance Scale

Male partner resistance is identified as a key factor that influences women’s contraceptive use. Examination of the masculine norms that shape men’s resistance to contraception—and how to intervene on these norms—is needed. To assess a gender-transformative intervention in Kenya, we developed and evaluated a masculinity-informed instrument to measure men’s contraceptive acceptance—the Masculine Norms and Family Planning Acceptance (MNFPA) scale. We developed draft scale items based on qualitative research and administered them to partnered Kenyan men (n = 150). Item response theory-based methods were used to reduce and psychometrically evaluate final scale items. The MNFPA scale had a Cronbach’s α of 0.68 and loaded onto a single factor. MNFPA scores were associated with self-efficacy and intention to accept a female partner’s use of contraception; scores were not associated with current contraceptive use. The MNFPA scale is the first rigorously developed and psychometrically evaluated tool to assess men’s contraceptive acceptance as a function of male gender norms. Future work is needed to test the MNFPA measure in larger samples and across different contexts. The scale can be used to evaluate interventions that seek to shift gender norms to increase men’s positive engagement in pregnancy spacing and prevention.


Introduction
Male partners who resist contraceptive use undermine women's reproductive autonomy and contribute to high undesired pregnancy rates in sub-Saharan Africa (SSA). In this region, an estimated 21% of reproductive-age women who wish to avoid pregnancy are not using a modern contraceptive method-the highest proportion in the world (Guttmachernstitute, 2017)-and opposition from male partners is often identified as a factor driving women's contraceptive nonuse (Apanga & Adam, 2015;Eliason et al., 2013;Imbuki et al., 2010;Palamuleni, 2013). Scholars have thus increasingly called for the inclusion of men in efforts to improve the use of contraception and strengthen reproductive autonomy, particularly given that spousal discussion and joint decisionmaking have been associated with women's ability to initiate and continue using contraception when desired (Hartmann et al., 2012;Nketiah-Amponsah et al., 2012;Ntshebe, 2011;Ogunjuyigbe et al., 2009;Tumlinson et al., 2013).
Men may oppose contraceptive use due to a lack of knowledge and fears about side effects or complications (Kabagenyi et al., 2014;Koffi et al., 2018;Schuler et al., 2011). Studies have shown that men are also very concerned about contraception's perceived potential to bolster women's reproductive autonomy (Kabagenyi et al., 2014;Mosha et al., 2013) and to undermine their male-dominated decision making in relationships and households (Geleta, 2018;Withers et al., 2015b). This perceived conflict between contraceptive use and men's ability to conform to their ideas of what an ideal man is consistent with research that has long emphasized the significance of gender norms in shaping health (Fleming & Agnew-Brune, 2015). For example, a growing literature on masculinity in SSA (Dworkin et al., 2012(Dworkin et al., , 2013aOdimegwu et al., 2013;Shefer et al., 2008;Sideris, 2004;Silberschmidt, 2011;Stern & Buikema, 2013;Wyrod, 2008) and elsewhere (Fleming et al., 2013;James-Hawkins et al., 2019;Jordal et al., 2015;Maternowska et al., 2014;Wentzell & Inhorn, 2014) has illuminated how men's adherence to masculine ideologies and their navigation of social expectations of manhood can influence their relationship dynamics and behaviors, with concomitant effects on health outcomes for both themselves and their female partners.
Masculine norms have been found to be associated with behaviors that increase sexual and HIV risk, including lack of condom use and multiple sexual partnerships (Fleming et al., 2016); intimate partner violence perpetration Willie et al., 2018); lower rates of HIV testing (Sileo et al., 2018) and engagement in the HIV care continuum (Sileo et al., 2019); low levels of reproductive healthcare utilization (Maternowska et al., 2014); and contraceptive nonuse (Maternowska et al., 2014;Withers et al., 2015aWithers et al., , 2015b. Amplifying these effects are societal changes, such as gains in women's rights and decreases in employment and economic stability, that can bolster anxiety about an inability to achieve prevailing expectations of manhood and further drive resistance to behaviors perceived to be out of sync with male gender norms (Dworkin et al., 2012;Morrell, 2002;Silberschmidt, 2011;Shefer et al., 2008;Sideris, 2004;Wyrod, 2008).
Involving men and actively addressing their views about masculinity and gender equality could thus have the potential to decrease their resistance to gains in women's reproductive autonomy and encourage their positive involvement as partners and allies (Dworkin, 2015;Dworkin et al., 2011). To this end, sexual and reproductive health (SRH) programs are now being called on to constructively address the role of gendered power relations and male gender norms in SRH behaviors and outcomes (Barker et al., 2010;Starrs et al., 2018). Gender sensitive and transformative interventions that seek to change gender inequality and male attitudes and behaviors have been found to be effective in the HIV and gender-based violence fields (Dworkin, 2015;Dworkin et al., 2013b); however, relatively few interventions have attempted to directly shift masculine norms toward more acceptance of contraceptive use and working with a female partner to achieve reproductive preferences (Ghanotakis et al., 2017;Schulermm et al., 2015;Shattuck et al., 2011;Wegs et al., 2016), and a recent systematic review has highlighted how few rigorous intervention studies have been conducted in this area (Ruane-McAteer et al., 2019). Moreover, as SRH efforts increasingly intervene on the relationship between deep-seated beliefs about masculinity and male contraceptive resistance, it is imperative to be able to evaluate the effects of these interventions. In a recent review of women's empowerment and gender-related measures used in family planning and maternal health program evaluations, Mandal et al. (2017) described the dearth of validated measures and the need for rigorous measures of gender norm change.
The few SRH interventions that have attempted to address masculine norms related to family planning assessed outcomes using measures of gender equitable attitudes (using or adapting the Gender Equitable Men [GEM] scale) (Ghanotakis et al., 2017;Schuler et al., 2015;Shattuck et al., 2011) and women's empowerment (via CARE's WE-MEASR tool) (Wegs et al., 2016). In our work, we have found that men's contraceptive resistance is not fueled exclusively by their endorsement of gender inequality but also by their fears of a loss of masculine identity (Withers et al., 2015a(Withers et al., , 2015b). Yet, we are not aware of a psychometrically tested instrument that has been systematically and rigorously designed to measure changes in the ways men see women's contraceptive use as undermining or bolstering their sense of themselves as men. Thus, a masculinities-informed understanding of men's reactions to contraception is urgently needed.
We implemented a pilot study in Kisumu County, western Kenya, to evaluate a gender-transformative intervention to shift masculine norms related to male contraceptive resistance toward greater acceptance of contraception. To investigate the intervention's effect, we used formative research and baseline data to develop and evaluate a novel, masculinity-driven quantitative instrument to measure men's acceptance of contraception-the Masculine Norms and Family Planning Acceptance (MNFPA) scale. This paper describes the development and preliminary evaluation of the MNFPA scale, the associations between MNFPA scores and the perceived ability and willingness to accept a female partner's contraceptive use, and the relationship between MNFPA scores and current contraceptive use.

Method
The creation of the MNFPA scale was informed by the construct modeling approach to scale construction (Wilson, 2005). This method entails an iterative process that begins with delineating a conceptual model, situating the construct within that model, clearly defining the construct, designing items to assess the construct based on qualitative data, and finally using a statistical measurement model to relate item responses back to the construct.
Our team carried out extensive formative research over a six-year period among men, women, couples, and healthcare providers in southwestern Kenya that enabled us to flesh out the factors that shape men's contraceptive resistance and acceptance. In concert with a large-scale cluster randomized trial evaluating the impact of integrating contraceptive care into HIV services , this research aimed to understand perceptions, attitudes, decision-making, and relationship dynamics related to planning a family and contraceptive use (Harrington et al., 2012(Harrington et al., , 2013Newmann, 2010;Newmann et al., 2013aNewmann et al., , 2013bPatel et al., 2014;Steinfeld et al., 2013;Tao et al., 2015;Withers et al., 2013Withers et al., , 2015aWithers et al., , 2015b. In particular, we investigated gender power dynamics within couples related to contraceptive use and, relatedly, men's perspectives on contraceptive use and male involvement in women's health issues-areas underrepresented in the literature at the time. Our qualitative research confirmed that many women were structurally and interpersonally disempowered relative to men, feared male resistance to contraception, and faced difficulty discussing pregnancy spacing and contraceptive use with their male partners. These factors contributed to covert and nonuse of contraception (Harrington et al., 2012(Harrington et al., , 2013Newmann, 2010;Newmann et al., 2013aNewmann et al., , 2013bTao et al., 2015;Withers et al., 2013). Our findings suggested that gender norms played a key role in these relationship dynamics around contraceptive use. While many men perceived advantages to using contraception, particularly the financial benefits of smaller families and improved health and well-being of female partners and families with birth spacing (Withers et al., 2015b), resistance was pronounced.
A key theme that emerged was fear that contraceptive use and limiting family size undermined their male roles in families and communities (Newmann, 2010;Withers et al., 2015aWithers et al., , 2015b. Specifically, contraception was perceived to conflict with masculine norms concerning fertility (male duty to father children); land (paternal family lineage and land inheritance); wealth (perceived wealth and social status of larger families); and sexuality (male discomfort with discussing sex), as well as with patriarchal norms related to male decision-making power in sexual relationships. These concerns were amplified by frustrations over the inability to fulfill traditional expectations of masculinity regarding male economic providership and household authority; many men described grappling with rapidly changing gender roles due to women's increasing labor force participation and involvement in family decision-making. Finally, men felt unknowledgeable about family planning, fueling concerns about side effects and complications, due to their exclusion from the "female domain" of contraceptive services (Newmann, 2010;Patel et al., 2014;Withers et al., 2015aWithers et al., , 2015b.

Conceptual Model and Definitions
In developing our conceptual model representing male acceptance of contraception, we drew from two genderrelated theoretical frameworks and two behavior change theories that were consistent with our formative research findings. Connell's (1987) theory of gender and power (TGP) characterizes the gendered relationships between men and women as being a function of social structures and norms that shape gender roles and gender power dynamics. This theory has been used to highlight the ways in which these gendered relationships can increase women's vulnerability to adverse health outcomes (Wingood & DiClemente, 2000). The second theory, Courtenay's (2000) constructionist theory of masculinity, posits that ideas about what it means to be a man are locally and regionally constructed, can change, and can therefore be intervened upon to improve gender equity and health. Courtenay argued that men organize their beliefs and actions with reference to the way they perceive men ought to be, and these beliefs and actions can negatively impact their own health and that of their partners. We operationalized TGP and Courtenay's theory through a focus on the role that male partners can play in influencing women's contraceptive behaviors, particularly through their endorsement of social norms regarding contraception and masculinity. Finally, in delineating the hypothesized variables that drive male contraceptive acceptance, we drew from social cognitive theory (SCT) (Bandura, 1989) and the theory of planned behavior (TPB) (Ajzen, 1991) to include contraceptive self-efficacy and intention in order to address the importance of the social environment (SCT) and intention (TPB) in learning and performing new behaviors.
In our resulting conceptual framework ( Fig. 1), we centered and defined male acceptance of contraception as (1) respecting a female partner's contraceptive decisions, (2) approving of her contraceptive use, (3) agreeing to male condom use, and/or (4) being positively involved in contraceptive decisions, including communication and joint contraceptive decision-making with a female partner, accompanying a partner to a clinic that offers contraceptive services, and/or participating in contraceptive counseling. We posited that male contraceptive acceptance was shaped by both selfefficacy and intention to use contraception; these variables, in turn, were influenced by behavioral capability (knowledge and skills related to contraception), attitudes toward contraception, masculine norms regarding contraception, and subjective norms.
Given the prominent role that gender norms played in men's contraceptive resistance in our formative research and the lack of existing instruments to measure masculine norms related to contraception, we focused our instrument development on the masculine norms construct. Specifically, we defined this construct, MNFPA, as reconfigured beliefs about masculinity that embody contraceptive acceptance and gender equality. Per the qualitative work, we viewed masculine norms as perceptions of male duties and expectations regarding sexuality and reproduction, land and wealth, and decision-making and household authority.

Item Development
Drawing directly from comments and insights from our qualitative data, we drafted items to capture manifestations of masculine norms in the context of contraceptive use and the planning of one's family. The study team, including Kenyan co-investigators, iteratively reviewed, discussed, and modified items to ensure that they were clear, relevant to the cultural context, and encompassed what we felt was the full scope of participants' perspectives represented in the data. To further ensure content validity, we consulted three colleagues with expertise in measurement development and male SRH engagement to review and provide feedback on the items.
Our item formation process resulted in 44 potential items with four Likert response categories that included strongly agree, agree, disagree, and strongly disagree; responses were coded depending on the item's direction, so that the highest response category reflected the highest contraceptive acceptance. While the scale was designed to measure male acceptance of contraception and the planning of one's family, we used the term "family planning" in the scale title and items because, in our study region, men and women most commonly use the term "family planning" to refer to "contraception." Item comprehension was assessed through one-on-one cognitive interviews with 10 men in Kisumu County, Kenya, before initiating the quantitative field test. Male interview participants were asked to reflect on items as they completed them, indicating to the interviewer how they interpreted items to ensure that items were understood as intended. Participants also gave feedback on item clarity and preferences for response categories. Draft items were revised as needed based on the cognitive interview feedback.

Quantitative Field Test
The 44 revised draft items were administered as a field test to 150 men in two communities of similar size and demographic profile in Kisumu County. Located in southwestern Kenya on the border of Lake Victoria, Kisumu is a semi-urban county where the primary occupations are in agriculture, unskilled manual labor, or domestic service (Kenya National Bureau of Statistics and ICF International, 2014). Nearly one quarter of married women aged 15-49 years have an unmet need for contraception, and the HIV prevalence, at 20%, is 3.4 times We purposively sampled and recruited Dholuo-speaking, partnered men of reproductive age using direct contact from male-focused social venues, such as soccer matches and bicycle taxi termini, or from their homes. Each participant gave informed voluntary written consent before being enrolled. Trained interviewers who were recruited from the local community administered the surveys in the Dholuo language on paper and in person at the participants' home or preferred location. Study approval was granted by the Committee on Human Research at the University of California, San Francisco and the Scientific and Ethics Review Unit at the Kenya Medical Research Institute.

Psychometric Evaluation
We used item response theory-based methods (IRT), in concert with classical test theory approaches, to reduce the item set and evaluate the psychometric properties of the final scale, following guidelines for the psychometric testing of new instruments (AERA, APA, & NCME, 2014; Wilson, 2005). IRT is a leading statistical approach to the development of latent variable measures, including participant reported outcomes (de Boeck & Wilson, 2004;Embretson & Reise, 2000;Hays et al., 2000;Wilson et al., 2006). Preliminary item responses were fit to a unidimensional partial credit IRT model for polytomous items using ACER ConQuest software (Adams et al., 2016;Masters, 1982). We assessed model fit using weighted mean square statistics, removing items falling outside of 0.67-1.33 as a guideline (Wright & Masters, 1982), and internal consistency reliability with the separation reliability coefficient. To assess internal structure validity, we investigated whether respondents endorsing higher categories on each item had higher overall scale scores. To ensure the scale met the assumption of unidimensionality for the IRT model, we supplemented IRT analyses with exploratory factor analysis and ensured items all loaded onto one factor with an eigenvalue of ≥ 1.0 (Kaiser, 1960). We also calculated the Cronbach's (1990) α. At this stage, we removed items that reduced the scale's reliability, those with highly skewed distributions, and those with conceptual overlap with other, better performing items. Given that many of the items had responses reflecting high levels of contraceptive acceptance, we collapsed the two lowest response categories.
In evaluating the final instrument, we again fit responses to the reduced item set to the partial credit model and assessed model fit, internal consistency reliability, and internal structure validity. To garner evidence for external validity, we evaluated the association between MNFPA scores and two constructs we hypothesized to be affected by masculinity norms about contraceptive use: contraceptive self-efficacy and contraceptive intention (Fig. 1). The self-efficacy and intention items were developed based on the formative research and were comparable to self-efficacy and intention questions used in prior research. We used ordinal logistic regression to test the association between MNFPA scores and responses to questionnaire items probing these two constructs. Given that intention responses would be dependent on pregnancy desire, the intention analysis was restricted to men who reported not wanting pregnancy within the next three months. We also assessed differential item functioning (DIF) to determine whether any scale items performed differentially among men by age (< 30 vs. ≥ 30), education (up to primary vs. more than primary), number of children fathered (< 3 vs. ≥ 3), and HIV status (negative vs. positive). We used item-by-group parameter effect size of ≥ 0.6 logits as suggestion of DIF (Longford et al., 1993;Paek, 2002).
To begin to explore the role of MNFPA in shaping contraceptive use in the longitudinal data of our gender-transformative pilot study, we examined sociodemographic factors associated with MNFPA scores and then the association between MNFPA scores and reported contraceptive use cross-sectionally. We used multivariable linear regression to examine key sociodemographic variables associated with MNFPA scores and multinomial logistic regression to assess the association of MNFPA scores with contraceptive method use (dual hormonal/sterilization and condom, hormonal/sterilization only, condom only, neither). Given our limited sample size and the exploratory nature of analyses, we reported significance to the p-value < .10 level.

Results
Respondents were on average 33 (range: 20-62) years old, and 40% had more than a primary school education. Nine percent were in a polygamous marriage or relationship, and 61% had fathered three or more children. Seventeen percent reported that they were HIV positive or did not know their status (Table 1). Overall, participants demonstrated relatively high levels of contraceptive acceptance in response to MNFPA items. For instance, 75% percent of men strongly disagreed that women who initiate contraceptive discussions are trying to take power away from men. At the same time, only 7% of respondents disagreed or strongly disagreed that a woman should seek permission from her male partner to use a contraceptive method. About one half of the men strongly agreed or agreed that a man has the final say in contraceptive decisions (data not shown).
The 10 final scale items fit a unidimensional partial credit item response model and had a separation reliability of 0.67 (Table 2). Most scale items met criteria for internal validity, including correspondence between each item's response categories and overall scale scores. For three items, those providing the lowest responses (strongly agree or agree together) had slightly higher average MNFPA scores than those answering disagree (Items 2, 3, and 8). Items performed non-differentially by age and number of children. We identified some evidence of DIF by education and HIV status for Item 8: men with more than a primary education and HIVnegative men were more likely to disagree with the statement that "A man has the final say in family planning decisions" compared to those with a primary education or less, or those who were HIV-positive, respectively.
Using summed raw responses, average scores were 13.3 (SD: 3.5, Min: 2, Max: 20) on the 0-20 scale; the distribution was near normal with a left skew (Cronbach's α: 0.68) (Fig. 2). All items loaded onto a single factor with eigenvalue > 1.0. There were no significant differences in average MNFPA scores by any sociodemographic characteristics.
As hypothesized, men scoring higher on the MNFPA scale exhibited higher levels of contraceptive self-efficacy and intention (Table 3). For each increased point on the MNFPA scale, there was a significant increase in perceived ability to use contraception even when faced with public ridicule (OR = 1.18, 95% CI: 1.04, 1.33); increasing MNFPA scores were negatively associated with finding it difficult to accept a main partner's contraceptive use because it challenges the respondent's role as a man in his household (OR = 0.80, 95% CI: 0.72, 0.88) and in his community (OR = 0.83, 95% CI: Of men who did not desire pregnancy within three months, a majority (58%) reported their partner was currently using a hormonal contraceptive method or sterilization, most commonly the implant (30%) and injectable (29%) ( Table 1). Overall, 24% reported using male condoms and either a hormonal method or sterilization, 45% reported using a hormonal method or sterilization alone, and 14% used male condoms alone, while 18% used neither. MNFPA scores among these groups were 13.2 (dual), 14.0 (hormonal or sterilization alone), 13.9 (condom alone), and 13.0 (neither) (data not shown). There were no significant differences in contraceptive use by MNFPA score (Table 4).

Discussion
The MNFPA scale is the first psychometrically assessed tool to measure male contraceptive acceptance within the context of masculine norms. The rigor of our scale development process, including the theory-informed development of a conceptual framework, careful creation of items based on extensive formative research, and use of advanced scale evaluation methodologies, supports the construct validity of the MNFPA measure. Additionally, the association between contraceptive self-efficacy and intention and scale scores shows alignment with our conceptual model and further supports For all MNFPA items, disagreeing indicates higher levels of male acceptance of contraception. Items were scored: 0 = strongly agree or agree, 1 = disagree, 2 = strongly disagree Item fit and difficulty/location (in logits) are derived from a partial credit item response model. Item fit is the weighted mean-squared fit t-statistic  the external validity of the measure. Finally, our efforts to identify the specific male gender norms most strongly tied to contraceptive use provides useful guidance to other researchers and program developers who are seeking to understand and measure these norms in their SRH work with men. Our finding that MNFPA scores were not significantly associated with reported use of contraception highlights the complexity of the relationship between men's acceptance of contraception and actual couples' contraceptive use. Myriad factors, male contraceptive acceptance among them, influence a woman's use of contraception, including her personal attitudes toward contraception, pregnancy preferences, and access to contraceptive services. It is also likely that one's social networks influence whether their contraceptive acceptance translates into actual use (Lapinski & Rimal, 2005). For example, perceiving disapproval from other men in the community may deter a man from acting to initiate a method. The role of social networks in supporting or undermining an individual's reproductive preferences is well documented (Igras et al., 2017). Our small sample and high reported contraceptive use may have also hindered our ability to detect an association between contraceptive acceptance and use. Additionally, our crosssectional results may be affected by time-dependent confounding; women in strongly gendered relationships may seek the use of contraception at higher rates, or men's acceptance of contraception may be negatively affected by a partner's contraceptive use, particularly if the method was initiated without the man's knowledge, which is a reported source of strain and distrust in relationships (Harrington et al., 2016;Koffi et al., 2018).
HIV-positive men in our sample were more likely to report condom use-with or without a hormonal method-than HIV-negative men. Although our small sample size precluded our formal evaluation of interaction, it is likely that the relationship between MNFPA and contraceptive use also differs by HIV status. Studies have shown that HIV status can affect fertility desires (Wekesa & Coast, 2014;Withers et al., 2013), and in a high HIV prevalence area like western Kenya, the imperative for HIV prevention combined with societal pressure and personal desire to restrict or pursue future childbearing may shape contraceptive attitudes and behaviors in complex ways. Moreover, male contraceptive acceptance may influence the use of different contraceptive Table 3 Association between MNFPA scores and contraceptive self-efficacy and intention a Response options for the dependent variable included 0 = strongly disagree, 1 = disagree, 2 = agree, and 3 = strongly agree b Response options for the dependent variable included 0 = strongly agree, 1 = agree, 2 = disagree, and 3 = strongly disagree c Excludes participants desiring pregnancy within 3 months; n = 137 methods in ways not necessarily associated with the effectiveness of the method for pregnancy prevention, particularly if men and women prioritize other considerations in their method choice (such as HIV prevention). In a recent review of the measurement of social norms affecting modern contraceptive use, all but two studies used condom use as their outcome of interest, demonstrating a gap in the evidence base concerning the relationship between norms and hormonal methods of contraception (Costenbader et al., 2017). Our scale items did not specify barrier or hormonal methods, so our results may not have captured nuances in the relationship between acceptance and use for these two method groups. Additionally, our conceptual model and scale items did not differentiate between methods that women control versus those that men themselves can use (withdrawal, condoms, vasectomy), and it is possible that the influence of male contraceptive acceptance, especially against the backdrop of masculinity, may play out differently for female and male methods. Better understanding these potentially different causal pathways can also help broaden SRH interventions with men to address them as contraceptive users in their own right, rather than primarily as a conduit for increasing female use (Hardee et al., 2017). Continued research is thus urgently needed, including longitudinal assessments with different populations of men and women, to tease apart the complex relationship between contraceptive use and male gender norms.
While strengthened by a careful and rigorous scale development process, our study also had a number of limitations. Our scale items were developed for use in western Kenya, and they may not be generalizable to other areas and populations. Due to feasibility constraints, we integrated this measure development work into a small, ongoing longitudinal study; we were unable to reassess item performance in a second, separate sample. Future work utilizing the MNFPA scale should reassess its psychometric performance, including differential item functioning, in different and larger samples.
Scale responses may have been vulnerable to social desirability bias. In an attempt to mitigate this type of bias, we employed local interviewers who were unknown to participants. High MNFPA scores may have also been the result of our purposive sampling procedures, which could have recruited men who already endorsed high levels of contraceptive acceptance, particularly given the high contraceptive use rates reported at baseline. Family planning research studies and programs are common in the study area, which may have also had an impact on the high contraceptive prevalence among the population we sampled from. Future research may consider limiting eligibility to non-contracepting men who do not desire pregnancy in the near future. Finally, future work with our scale items might work to better differentiate respondents at the highest levels, perhaps through use of different response categories.
Overall, the MNFPA scale is a promising contribution to the ongoing work to positively and meaningfully engage men in efforts to improve SRH and strengthen women's reproductive autonomy. The scale may facilitate more valid evaluations of interventions that seek to transform male gender norms to embody more contraceptive acceptance and gender equity. Future researchers and program developers should continue to explore these norms as well as the multifaceted relationship between masculinity, contraceptive acceptance, and women's contraceptive preferences and use.
Funding This work was supported by the Society of Family Planning Research Fund and by the University of California, San Francisco Academic Senate through its Research Allocation Program.

Compliance with Ethical Standards
Conflict of Interest The authors declare that they have no conflict of interest.
Ethical Approval All procedures performed in studies involving human participants were in accordance with the ethical standards of the Committee on Human Research at the University of California, San Francisco (IRB #: 15-17339) and the Scientific and Ethics Review Unit at the Kenya Medical Research Institute (Protocol #: KEMRI/SERU/ CMR/P00030/3303), and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the authors. Informed consent was obtained from all individual participants included in the study.
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