Abstract
Introduction and hypothesis
The aim of this study was to translate the Pelvic Floor Distress Inventory-Short Form 20 (PFDI-20) into Japanese and test its reliability and validity among Japanese women.
Methods
Fifty-nine women with and without pelvic floor disorders (age 55.8 ± 16.8 years, mean ± SD) completed the Japanese PFDI-20 (J-PFDI-20) questionnaire at baseline and 2 weeks later. Intraclass correlation coefficients (ICC) and the Bland and Altman method for test-retest reliability and Cronbach’s alpha for internal consistency of the J-PFDI-20 were used. Scores of total and subscales were compared between women with and without pelvic floor disorders for known-groups validity. Spearman’s correlation coefficients between the J-PFDI-20 and the severity of pelvic floor disorders and Urinary Incontinence Quality of Life Scale (I-QOL) were used for construct validity.
Results
The PFDI-20 was successfully translated from English into Japanese with face validity through rigorous cross-cultural validation. Test-retest reliability of the J-PFDI-20 and three subscales was good to excellent (ICC = 0.77–0.90). The Bland and Altman analysis showed that differences between the first and second scores of total J-PFDI-20 and its subscales were not significantly different from 0 and largely fell within the range of 0 ± 1.96 SD. Cronbach’s alpha values were 0.52–0.83. Analysis of known-groups validity showed differences in scores of the J-PFDI-20 between women with and without pelvic floor disorders. Acceptable construct validity was found in J-PFDI-20 total and subscale scores with positive correlations to severity of pelvic floor disorders (ρ > 0.35) and negative correlations to I-QOL (ρ < -0.39).
Conclusions
The results suggest that the J-PFDI-20 is a reliable and valid condition-specific quality of life instrument for women with pelvic floor disorders.
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Acknowledgements
This study was part of a research project funded by the Japanese Association for Sex Education in 2009. The authors are grateful to the participants for their cooperation. The authors would like to thank Dr. Tetsuya Fujimura, M.D., Ph.D., and Dr. Yuzuri Tsurumaki Sato, M.D., Ph.D., at the Department of Urology, The University of Tokyo, for their assistance throughout this study.
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Yoshida, M., Murayama, R., Ota, E. et al. Reliability and validity of the Japanese version of the pelvic floor distress inventory-short form 20. Int Urogynecol J 24, 1039–1046 (2013). https://doi.org/10.1007/s00192-012-1962-1
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DOI: https://doi.org/10.1007/s00192-012-1962-1