The Female Sexual Function Index: reliability and validity in Spanish postmenopausal women

Objective: To examine the reliability and validity of the Spanish version of the Female Sexual Function Index (FSFI) and its ability to discriminate between women with and without female sexual dysfunction (FSD) among Spanish postmenopausal women. Methods: A total of 152 postmenopausal women completed the Spanish version of FSFI. Internal consistency, test-retest reliability, and construct validity (exploratory factor analysis) were analyzed. Concurrent and divergent validity were assessed using a visual analog scale for overall satisfaction with sexual life and the Hospital Anxiety and Depression Scale, respectively. To determine the ability and the accuracy of the FSFI total score in discriminating between women with and without FSD, a receiver-operating characteristic curve analysis was performed. Results: Factor analysis suggested a three-factor structure (explained variance 77.77%). The Spanish FSFI showed substantial-to-excellent test-retest reliability, with good internal consistency in the FSFI total score (Cronbach's alpha = 0.964), and also in its three dimensions. The FSFI total and domains scores showed strong (r > 0.50) and significant correlations (P < 0.01) with overall satisfaction with sexual life (concurrent validity), and low correlations with anxiety and depression (divergent validity). The Spanish FSFI total score and dimensions were significantly able to discriminate between women with and without FSD (P < 0.05), with an optimal cut-off point of <24.95 for the FSFI total score (64.15% sensitivity and 75.76% specificity). Conclusions: The Spanish FSFI is a valid and reliable instrument for assessing and discriminating for FSD among Spanish postmenopausal women.