The sample of current cross-sectional study included 225 participants who were selected through convenience sampling method. The statistical population included all individuals with a high score in scrupulosity and those with a low score referred to psychiatric hospitals and clinics in Tehran, Iran, in 2019. Meanwhile, a group of religious people with no psychiatric disorders were considered. To assign patients into two groups, five different treatment centers were randomly selected. After making the necessary arrangements, the clinical psychologists met the patients who were diagnosed with OCD by a psychiatrist in the treatment centers. The inclusion criteria for both groups were being diagnosed with OCD by a psychiatrist, being in the age range of 18 - 65 years, and not having a chronic physical illness. The exclusion criteria were having psychotic disorders and substance abuse.
Also, the normal religious group was chosen from the patients’ companions and employees of the Iran University of Medical Science through convenience sampling. These individuals were matched with the clinical sample in terms of demographic characteristics and other personal and clinical information. After explaining the study goals to all participants, a written informed consent was obtained.
After sampling, structured clinical interview for DSM-5 disorders-clinical edition (SCID-5-CV) was administered by a professional clinical psychologist. After confirming the OCD diagnosis by a psychiatrist and through clinical interview, the participants were asked to fill out the Yale-Brown Obsessive-Compulsive Scale (Y-BOCS) and were divided into religious individuals and those with a low score in scrupulosity. Therefore, based on three items used for psychiatric diagnosis, namely the SCID, Y-BOCS, and the Penn Inventory of Scrupulosity (PIOS), individuals with a high score in scrupulosity were distinguished from those with a low score. Finally, the Young Schema Questionnaire-Short Form (YSQ-SF) and Schema Mode Inventory (SMI) were distributed among both groups. After completion, every questionnaire was examined by the researcher so that no questions were left unanswered. All incomplete questionnaires were returned to the participants to be revised.
In the present study, the following scales were used:
1. Demographic Characteristics Questionnaire: This researcher-made questionnaire includes age, sex, marital status, employment status, educational status, previous history, duration of OCD, and history of psychological disorders (clinical and personality disorders) and received treatments.
2. Structured clinical interview for DSM-5 disorders-clinical edition (SCID-5-CV): This tool is a semi-structured clinical and diagnostic interview developed by First et al. The validity and reliability of this instrument have been evaluated and confirmed. Kapa criterion for all diagnoses except anxiety disorder was higher than 0.4, indicating moderate agreement. However, in anxiety disorders, the kappa was 0.34, indicating an average agreement between the two reports of the psychiatrist and the SCID interviewer (
24). The sensitivity of all diagnoses is higher than 0.80 (
25).
3. Yale-Brown Obsessive-Compulsive Scale (Y-BOCS): This is a clinical scale devised by Goodman et al. (1989) used to rate the severity of obsessive thoughts and behaviors. The self-report checklist includes 16 subscales which are rated on a 5-point Likert scale. The questionnaire reports three scores: severity of obsessions (0 - 20), severity of compulsions (0 - 20), and a total score (0 - 20) (
26). The reliability of this questionnaire has been reported as 0.85 to 0.93 and the internal consistency of Cronbach’s alpha has been reported to be 0.69 to 0.91 (
26,
27). The reliability of the instrument in Iran was 0.98, internal consistency was 0.89, and test-retest reliability with a two-week interval was 0.84. The diagnostic validity of the instrument for severity and type of obsession has been reported to be 0.64 and 0.59, respectively (
28).
4. Penn Inventory of Scrupulosity (PIOS): The PIOS was devised by Abramowitz et al. (
29) and includes 19 self-report items to evaluate scrupulosity. PIOS includes two subscales, including fear of committing sins and fear of being punished by God. Participants are being evaluated on their religious dependence, as well as the degree to which they support their faith on a scale of 1 to 5. Abramowitz et al. reported the internal consistency of the questionnaire as 0.93. Factorial analysis of the test indicated that 15 items significantly correlated with OCD. In a study, Ramezani Farani (
30) applied the test on 30 students and reported the internal consistency as 0.82 and a very good test-retest reliability.
5. Questionnaire of Practicing Religious Traditions (Mabad Scale): This scale consists of 25 items designed by Golzari (
31) and evaluates practicing Islamic beliefs. Every item of the questionnaire includes five choices which are rated from 0 to 4. Test-retest reliability was 76%, split-half reliability was 91%, and Cronbach’s alpha was 94%. In addition, concurrent validity of the questionnaire was investigated through comparing the results obtained from religious and non-religious people (
31).
6. Young Schema Questionnaire-Short Form (YSQ-SF): YSQ-SF is a 75-item self-report questionnaire designed by Young (1990) that investigates 15 EMSs (emotional deprivation, abandonment/instability, mistrust/abuse, social isolation/alienation, defectiveness/shame, failure, dependence/ incompetence, vulnerability to harm or illness, enmeshment/undeveloped self, subjugation, self-sacrifice, emotional inhibition, unrelenting standards/hypercriticalness, entitlement/grandiosity, insufficient self-control/self-discipline). The items are scored on a 6-point Likert scale (
32,
33). Khosravani et al. (
34) investigated the psychometric properties of the questionnaire in an Iranian population and, based on the obtained Cronbach's alpha, reported the internal reliability as satisfying and discriminant validity as acceptable. Also, in another study, by using Cronbach's alpha coefficient, the internal consistency for 17 questionnaire items was 62 - 90% (
35).
7. Schema Mode Inventory (SMI): SMI is designed by Young (
36) and includes 124 items to investigate 14 types of schema modes (vulnerable child mode, angry child mode, enraged child mode, impulsive child mode, undisciplined child mode, happy child mode, compliant surrender mode, detached protector mode, self -soother mode, self-aggrandizer mode, bully and attack mode, punitive parent mode, demanding parent mode, healthy adult mode). Lobbestael et al. (
36) reported the inventory to have high internal consistency, adequate test-retest reliability, and satisfying construct validity. The reliability of the inventory was also tested in an Iranian population. Cronbach’s alpha correlation coefficients were 0.97, 0.92, 0.8, 0.81, and 0.56 for the first through fifth subscales, respectively (
37).
Finally, data analysis using descriptive statistics (description of demographic data, mean and standard deviation of variables) and inferential statistics (one-way ANOVA and Kruskal-Wallis tests) were performed.