Maryam Nasirian - Epidemiology and Biostatistics Department, Health School; and Infectious Diseases and Tropical Medicine Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
Samira Hosseini Hooshyar - HIV/STI Surveillance Research Center, and WHO Collaborating Center for HIV Surveillance, Institute for Futures Studies in Health, Kerman University of Medical Sciences, Kerman, Iran
Ali Akbar Haghdoost - Modeling in Health Research Center, Institute for Futures Studies in Health, Kerman University of Medical Sciences, Kerman, Iran
Mohammad Karamouzian - HIV/STI Surveillance Research Center, and WHO Collaborating Center for HIV Surveillance, Institute for Futures Studies in Health, Kerman University of Medical Sciences, Kerman, Iran

Background Reliable population-based data on sexually transmitted infections (STI) are limited in Iran and selfreporting remains the main source of indirect estimation of STI-associated symptoms in the country. However, where and how the questions are asked could influence the rate of self-reporting. In the present study, we aimed to assess what questionnaire delivery method (ie, face-to-face interview [FTFI], self-administered questionnaire [SAQ], or audio self-administered questionnaire [Audio-SAQ]) and setting (ie, street, household or hair salon) leads to more reliable estimates for the prevalence of self-reported STI-associated symptoms.   Methods This cross-sectional study was conducted in winter ۲۰۱۴ on a gender-balanced (۵۰.۰% men) sample of ۲۸۸ individuals aged ۱۸–۵۹ years old in Kerman, Iran. Respondents were recruited in (a) crowded public places and streets, (b) their households, and (c) hair salons. Data was collected on history of current and ۶-month (ie, past ۶ months) STI-associated symptoms. Three different methods including FTFI, SAQ and or Audio-SAQ were applied randomly in households and non randomly in streets and hair salons to collect data among the respondents. Generalized estimating equation (GEE) was used to compare the settings and methods separately.   Results A total of ۲.۸% of men and ۹.۴% of women self-reported at least one STI-associated symptom. Respondents were significantly more likely to report STI-associated symptoms when completing questionnaires on the street compared to their household (P = .۰۰۰۱). While women were less likely to report symptoms in FTFI compared to SAQ (P = .۰۳۶), no significant differences were found between men’s responses across different methods (P = .۰۶۴).   Conclusion Further research is needed to evaluate the effect of different combinations of methods and settings to find the optimal way to collect data on STI-associated symptoms.

Sexually Transmitted Infection, Questionnaire, Self-report, Survey, Iran