Validation of the Vietnamese Translation Version of the Female Sexual Function Index in Infertile Patients

INTRODUCTION: The Female Sexual Function Index (FSFI) is regarded as a self-administered screening questionnaire for assessing the presence of any type of sexual dysfunction. AIM: The aim of this study was to investigate the psychometric properties of the Vietnamese translation version of the Female Sexual Function Index (VN-FSFI) in a sample of infertile Vietnamese women. METHODS: An existing Vietnamese translated-FSFI version was used as a first-step approach to back-translate into English. Based on the comparison of the original English version and the back-translation script, a modified version of the FSFI was revised. This version was evaluated for “content validity” by a panel of 3 experts and for “face validity” by a pilot study that was based on its results to refine to reach the last Vietnamese FSFI version (VN-FSFI version). A cross-sectional survey to investigate psychometric reliability and validity of the last VN-FSFI version was conducted with 271 infertile Vietnamese women from January 2017 through February 2018, at a hospital located in a central region of Vietnam. Construct validity was evaluated by principal component analysis using varimax rotation and factor analysis. Reliability studies on internal consistency (Cronbach’s alpha coefficient, domain inter-correlations, and domain-total correlations) and on test-retest (Intraclass correlation coefficient). MAIN OUTCOME MEASURE: Construct validity and the reliability of the VN-FSFI version. RESULTS: Based on principal component analysis, a 5-factor model was established, consisting of arousal/orgasm, satisfaction, pain, lubrication, and desire that explained 72.32% of the total variance. The factorial structure supported to 6 retrieved domains that corresponded to the original version. The Cronbach’s alpha coefficients were 0.92 for the total scale and 0.72−0.89 for the domains. Domain inter-correlations ranged from 0.36−0.73 and domain-total correlation coefficients ranged from 0.67−0.84. Test-retest correlation coefficients over 2−4 weeks were 0.97 (P < .001) for the total scale and 0.84−0.96 for the domains. CONCLUSION: With good psychometric properties, which are almost similar to the original English version, this Vietnamese translation version of the Female Sexual Function Index (VN-FSFI version) was proved to be a valid and reliable instrument to measure multidimensional aspects of sexual function in infertile Vietnamese women. Ho TTT, Le MT, Truong QV, et al. Validation of the Vietnamese Translation Version of the Female Sexual Function Index in Infertile Patients. Sex Med 2019;8:57–64.