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Development of a questionnaire to measure perceived reasons for divorce seeking: an instrument development study

Background Subjective accounts of divorce seeking individuals is a useful complement to sociological and psychological causes of divorce at both individual and community level. Regarding the increasing trend of divorce worldwide, the need for a questionnaire measuring subjective reasons of divorce is felt more and more. Objectives The aim of this study was to develop and validate perceived causes of a divorce questionnaire in Iranian society. Methods This was an instrument development study that carried out in 2016, based on extensive literature reviews and interviews with individuals referring to “Family Intervention Centers to Reduce Divorce” in Kerman, Fars and Alborz provinces (Iran). At first, 38 items expressing the perceived reasons for divorce were extracted; then, 29 items were used in the questionnaire according to the experts’ judgment. After that, the questionnaire was given to 570 participants. The structural validity was evaluated using two methods: exploratory factor analysis via principle axis factoring, and known group comparisons by paired-samples t-test. The internal consistency of the questionnaire was also examined by calculating the Cronbach’s alpha and corrected item-total correlation. SPSS version 20 was used for statistical analysis. Results The mean age (± SD) of women and men was 32.3 (±8.9) and 36.8 (±10.6), respectively. Based on an expert panel, content validity of 29 items was approved. Using principle axis factoring and varimax rotation, two components were extracted. These two factors were called “instrumental/external reasons” and “expressive and relationship-centered reasons.” Factor loading of all 29 items was higher than 0.32. Cronbach’s alpha of the two subscales was 0.84 and 0.85, respectively. Corrected item-scale coefficient of all items was more than 0.2. Conclusions According to the acceptable validity and reliability of the Perceived Reasons for Divorce Seeking Questionnaire, it can be used to ascertain people’s reasons for divorce seeking.


Introduction
Marriage is a part of life in almost all Western and Eastern culture (1). There are varied motives behind marriage including the need for social and emotional support, love and friendship and sexual relations (2). Divorce is considered a social issue when it exceeds the normal limit and becomes unconventional. In this regard, divorce is no longer a personal problem, but rather it is a multi-stage process that not only affects the way people interact in a family, but also causes severe harm to the community (3). Observing the circumstances of divorce is important not only from the aspects of its impact on the husband, wife and their children but also from the negative consequences on the whole society and economy such as the increased risk for major depression and poverty, and lower life expectancy (4). Divorce is one of the social harms which has significantly increased in most countries in recent decades (5). In recent years, the divorce trend and marriage instability have increased in Iran, which is currently considered one of the countries with high divorce rates (6). In 2011, the divorce rate in Iran was 2.5% per 1,000 in the age group of 15-64; it is even higher than the figure reported in some western countries including Ireland, Italy and Spain (6). Considering the increasing trend of divorce, paying attention to its causes is of particular importance (5). It is customary to ask the experts to understand the reasons and causes of these problems (5), and it is less likely to ask a layperson (7). There are three perspectives to determining divorce factors (7). In the sociological approach, phenomena such as individualism, modernization and life course predictors of divorce are discussed (7). In the psychological approach, variables such as personality traits, mental health and the quality of relationships between husbands and wives are considered (8). In the third approach, people are asked about the perceived causes of divorce (7). Amato and Previti stated that this research approach "provides a useful complement to more objective methods and is necessary for a full understanding of the divorce process." (7). Furthermore, in his well-known article, Slovic emphasized the layperson's viewpoint in planning to prevent community problems and stated, "their basic conceptualization of risk is much richer than that of the experts" (9). One of the strengths of using this method is that the reasons obtained from this kind of research are culturally appropriate (10). Moreover, planning to change the behavior of people "without understanding individuals' reason for engaging in the behavior, is condemned to failure" (11).
In Iran, few studies have been conducted on personal reasons of divorce, in which the questionnaires were researcher made with insufficient evidence of psychometric properties (12,13). The most comprehensive study regarding people`s reasons for divorce was done by Amato and Previti (7). In this study, they summarized the results of the related researches and concluded that infidelity was the most common reported reason for divorce (7). Despite introducing a comprehensive list of reasons in such studies, we found no study that had solely addressed a standard questionnaire regarding the issue. Although some research has been conducted in Iran on divorce etiology from the viewpoints of individuals facing divorce or those who are divorced, no questionnaire whose psychometric properties have been proved has been introduced in the literature, as far as it is concerned. The aim of this study was to create a questionnaire about the perceived reasons for divorce seeking in Iranian society, which, in addition to using indigenous studies, may also be informative for family scholars in other countries. To the best of our knowledge, this is the first study introducing a questionnaire measuring people`s reasons for request for divorce, specifically.

Instrument
This was an instrument development study that carried out in 2016. At first, a questionnaire consisting of 38 questions was prepared based on the extensive literature review (7,(12)(13)(14) and interviews with couples seeking divorce and an expert panel focus group. The main source of item extraction was an Amato and Previti study (7) and a relevant study conducted in Tehran (13), and also the checklists and documents of the State Welfare Organization of Iran. After extraction of the first 38 items, we conducted face-to-face interviews with a subsample of 20 divorce volunteers to examine the comprehensibility and face validity of the items. The focus group consisted of five experts in divorce counseling. Their specialty was in community medicine, psychiatry, psychology, and counselling. The focus group discussion lasted 2 hours in one session. Then, the content validity of these questions was evaluated consensually, based on the judgment of the expert panel (15); the content validity and face validity of 29 questions was ultimately approved based on this qualitative method. It was named Perceived Reasons for Divorce Seeking Questionnaire (PRDSQ). Finally, these questions were given to 570 couples. They were enrolled in the study based on convenience sampling. Considering the subject to item ratio of 20, sample size was calculated to be 580 for factor analysis of the 29 items of the questionnaire (16). In the introduction of the questionnaire, respondents were asked to specify the role and importance of each item statement in their marital dissolution using a five-point Likert scale. Responses included the following: 0: Not at all important, 1: Low importance, 2: Moderately important, 3: Very important, 4: Extremely important. So the questionnaire would display the most and/or the least important personal reasons for divorce.

Setting
This was a methodological study, carried out in 2016 using a cross sectional design. The subjects of this study were consecutively recruited from the centers of three provinces of Kerman, Fars and Alborz. These subjects included couples who had referred to family courts for divorce and then had been referred by the court to "Family Intervention Centers to Reduce Divorce" of which there are certified consultants. All of the referees were invited to participate in the study and the only exclusion criterion was unwillingness to complete the questionnaire. In these centers, the questionnaires were given separately to the husbands and wives; after explaining the questionnaires, the couples were asked to complete the questionnaires anonymously. In addition to providing counseling services, these centers attempt to bring the couples back to their normal lives and persuade them not to seek divorce. If the consent is obtained and the divorce is canceled, an arrangement letter is issued; otherwise, a divorce certificate is issued.

Translation
Since the original questionnaire was in Persian, to assure equivalence of the English translated version, the process of forward and backward translation was performed (16). The content and semantic equivalence of the translated version was established.

Ethical considerations
The protocol for this study was approved by the Ethics Committee of Kerman University of Medical Sciences (code: IR.KMU.REC1394.740). Before study enrollment, oral informed consent was obtained from potential participants. Confidentiality of the data was assured.

Statistical analysis
To analyze the construct validity of the PRDSQ, two methods were used: exploratory factor analysis (EFA) and known group comparisons (16). Correlation matrix of each pair of variables was checked prior to conducting factor analysis. Factorability was assessed via Bartlett's test of sphericity and Kaiser-Meyer-Olkin (KMO) statistic. For EFA, extraction was performed using principal axis factoring, and varimax rotation was used (17). The number of factors was determined using scree plot (17). The items with a loading factor of higher than 0.32 were kept in the questionnaire (17). To understand the local independency of the items, residual correlations were calculated (18). According to Amato and Previti, the perceived causes of divorce in women are expected to differ from men since emotional and relational issues are more important in women`s views (7). Thus, the mean scores of the two factors of the PRDSQ were compared between women and their husbands using the paired-samples t-test (16). Two methods were used to analyze the reliability. Primarily, Cronbach's alpha of the factors constituting the questionnaire was calculated. In addition, Cronbach's alpha if an item deleted, was also measured for each item. In the second method, the corrected item scale correlation was calculated for the items and a coefficient higher than 0.2 was considered as an indication that each item in the scale is adequately associated with the total score (16). Ceiling and floor effects for each subscale were calculated.

Results
In this study, 1,140 people consisting of 570 couples in three provinces were enrolled. The demographic characteristics of men and women referred to these centers are shown in Table 1. Mean ± SD age male and female participants were 36.8±10.6 and 32.3±8.9 years, respectively. Both content and face validity of the 29 items were confirmed based on the opinions of experts and divorce seeking individuals, respectively. According to correlation matrix, there was no multicollinearity between the items (i.e., all coefficients were lower than ±0.90. Kaiser-Meyer-Olkin (KMO) measure of adequacy of samples was 0.922. P-value of the Bartlett's test of Sphericity was <0.001. Using principal axis factoring and varimax rotation, two factors were extracted (the loading factor of each item is shown in Table 2). Two factors were entitled "expressive and relationship-centered" and ""instrumental/external" factors. They explained 34.4% of the variance (27.5% and 7.9% for each factor, respectively). The scree plot ( Figure  1) confirmed the two-factor nature of the questionnaire. According to the loading factor (Table 2), questions 1, 2, 4, 5, 7-10, 12, 13, 17, 20-22, 28, and 29 were placed in the instrumental/external factor and the rest of the questions were placed in the expressive and relationship-centered factor. The residual correlation in all items was less than 0.1, indicating that the items were independent of one another and did not measure one thing. The results of the analysis of "Cronbach's alpha and corrected item-scale correlation" are shown in Table 2. Corrected item-scale correlation in all items was higher than 0.2. Cronbach's alpha of two "expressive and relationship-centered" and "instrumental/external" factors was 0.85 and 0.84, respectively. Comparison of the scores of these two factors between men and women suggested that the score was significantly higher in women than in men (Table 3). Moreover, the expressive and relationship-centered score in both women and men was higher than that of the instrumental/external factor. There were no floor and ceiling effects. As a whole, 1.5% and 0.1% of participants achieved the lowest and the highest possible score, respectively.

Discussion
In order to understand the etiology of divorce, it is important to understand the perceived causes of couples seeking divorce (7). This study showed that PRDSQ had acceptable validity and reliability to assess the personal causes of divorce. The strength of this study was that it used an adequate number of samples in three different provinces of Iran. Most studies conducted on the issue of divorce are mainly based on the expert's viewpoints and have not focused on the perceived reasons of people (7). Moreover, most studies published in international journals on perceived causes of divorce have been carried out in Western countries (19). In Iran, a small number of studies conducted on this issue either have not provided sufficient evidence concerning their validity and reliability of their tools (13,14), or have examined a specific subpopulation (12). Correlation matrix was in favor of patterned relationship amongst the items. The results of the KMO and Bartlett's tests indicated that the questionnaire was suitable for factor analysis and since the KMO number was greater than 0.9, it was considered as an excellent measure of sampling adequacy (20). Two components were extracted, based on scree plot. Concerning the content of the questions and according to Amato and Previti categorization of personal causes of divorce, we named these two factors "instrumental/external" and "expressive and relationship-centered" reasons (7). The two broad-spectrum subjective causes of divorce in a US population were studied to be either related to external factors such as financial problems and emotional and relational issues such as spouse's emotional abuse and/or infidelity (7). In a study conducted on divorce seeking women in Iran, four domains were explored based on factor analysis, in which three factors were related to the husband`s issues (social abnormalities, lack of social skills and wife neglect) and the fourth factor was related to the spouse`s family mismatches (12). In this study, most items focused on husband problems which may be due to the fact that all participants were women. In our study, we tried to enroll both couples to avoid any gender related bias when exploring the subjective reasons for divorce.
The loading factor of all 29 questions was above the acceptable level of 0.32 (17). None of the items had a residual correlation of higher than 0.1, indicating that the items were not similar and had no overlap, and every item asked about a separate and different issue (18). The amount of explained variance in our study was lower than the recommended value of 50% (20), which may be due to extraction of only two factors. Since "retaining too many factors can deplete the solution erroneously resulting in weak factor loadings" (20) and based on conceptual examination of the items, we preferred to emphasize on the two-factor solution. In the Iranian study on divorce factors among women, the proposed questionnaire, which consisted of 145 items, yielded four factors accounting for 41% of total variance (12). The score of the PRDSQ was greater in women that in men (in both subscales), in other words, women had more credence to both emotional and external factors compared to men. It has been well documented that women, more often than men, blame the divorce on relational and emotional factors such as general lack of love (7). Moreover, the relationship-centered reasons were taken into more consideration than the instrumental/external reasons, which is in line with the findings of relevant studies (7). The statistical difference between the views of men and women in both domains of the questionnaire (7) met the predefined expectations, and thus the known group validity of the questionnaire was confirmed (16). Cronbach's alpha of the two components of the questionnaire (both above the minimum acceptable level of 0.7) showed good internal consistency of the questionnaire. Corrected item-scale correlation in all items was higher than the minimum acceptable of 0.2, which was another reason for the reliability of the questionnaire (16). Both ceiling and floor effects were acceptable, which is in favor of content validity (21). The PRDSQ Cronbach`s alpha was higher than other Iranian questionnaires. In a study conducted on divorce seeking couples referring to Tehran Family Courts, the Cronbach`s alpha of the questionnaire was 0.7 (13) and the corresponding figure in another Iranian study was 0.6 (12). Nunnally suggested that at least two criteria should be used to assess the psychometric properties of the questionnaire in measuring both the validity and the reliability (22). Although confirmatory factor analysis was not checked, the validity of the questionnaire was calculated using three ways of content validity, factorial validity and known group validity, and reliability was measured through Cronbach's alpha and corrected item-scale correlation. The study had two limitations. First, it was preferable to use a more representative sample from all regions of the country. Second, to find out the number of factors, more objective methods rather than scree plot may be used.

Conclusions
In short, the findings showed that the psychometric properties of this questionnaire were acceptable for measuri ng the perceived causes of divorce seeking in Iranian society. The implication of the study is that it provides a framework for researchers and family counselors to explore the subjective and personal reasons for marital dissolution via a valid and reliable tool. Awareness of counsellors about perceived reasons for divorce seeking in referees to courts and counselling centers would improve the plans for early interventions to solve marital conflicts. To further confirm the construct validity of the PRDSQ it warrants future research using confirmatory factor analysis.