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Reliability and validity of a new sexual function questionnaire (Nagoya Sexual Function Questionnaire) for schizophrenic patients taking antipsychotics
Author(s) -
Kikuchi Tsutomu,
Iwamoto Kunihiro,
Sasada Kazumi,
Aleksic Branko,
Yoshida Keizo,
Ozaki Norio
Publication year - 2011
Publication title -
human psychopharmacology: clinical and experimental
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.461
H-Index - 78
eISSN - 1099-1077
pISSN - 0885-6222
DOI - 10.1002/hup.1205
Subject(s) - cronbach's alpha , convergent validity , psychology , sexual function , clinical psychology , discriminant validity , rating scale , discriminant function analysis , reliability (semiconductor) , epworth sleepiness scale , test (biology) , internal consistency , psychiatry , psychometrics , developmental psychology , statistics , power (physics) , physics , quantum mechanics , psychoanalysis , apnea , mathematics , paleontology , biology , polysomnography
Objective This study aims to validate a new user‐friendly sexual function questionnaire (Nagoya Sexual Function Questionnaire [NSFQ]) for schizophrenic patients taking antipsychotics. Methods Schizophrenic outpatients (men = 30, women = 30) were asked to fill out the NSFQ at initial entry into the research program (Time 1 ) and again 1 to 2 weeks later (Time 2 ). To assess the convergent validity of the NSFQ, at Time 1 , subjects were asked to fill out the Japanese version of the Udvalg for Kliniske Undersogekser Side Effect Rating Scale (UKU). To assess the discriminant validity of the NSFQ, at Time 1 , subjects were also asked to fill out the Japanese version of Epworth Sleepiness Scale. Results Results from Cronbach's alpha analysis indicated that the NSFQ demonstrated excellent internal consistency and scale reliability. The NSFQ also demonstrated strong test–retest reliability. The NSFQ total score was highly correlated with the UKU total score. The NSFQ was shown to have good convergent validity with the UKU. The NSFQ total score was not correlated with the Japanese version of Epworth Sleepiness Scale total score. Conclusions This study revealed the internal consistency, test–retest reliability, and convergent and discriminant validities of the NSFQ. Copyright © 2011 John Wiley & Sons, Ltd.