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Background  The Pelvic Girdle Questionnaire is the only instrument designed to assess pain and disability specifically in pregnant or postpartum women with pelvic girdle pain. The objective of this study was the adaptation to the Spanish language and analysis of the psychometric properties of the Pelvic Girdle Questionnaire.    Methods  This is a descriptive cross-sectional study divided into two phases. In the first phase, a translation and adaptation process was performed according to international guidelines. Secondly, the analysis of the properties of the Spanish version was conducted using a sample of 125 pregnant or postpartum women suffering from pelvic girdle pain. Participants completed the Spanish version along with five other measurement instruments through an online platform. Internal consistency, construct validity, test-retest reliability, the ceiling and floor effects, responsiveness and discriminatory ability of the Spanish version were analysed.    Results  The Spanish version of the  Pelvic Girdle Questionnaire  showed high internal consistency with Cronbach's alpha = 0.961, and an intraclass correlation coefficient of 0.962. The convergent validity showed high positive correlation with other questionnaires used. ROC curves showed no discriminatory capacity for number of sites of pain or pregnancy/post-partum state.    Conclusions  This article presents the translation, validation and psychometric properties of the Spanish version of the  Pelvic Girdle Questionnaire,  that has proved to be an appropriate and valid assessment tool of disability due to pelvic girdle pain in pregnant and postpartum women.    Electronic supplementary material  The online version of this article (doi:10.1186/s12955-017-0605-0) contains supplementary material, which is available to authorized users.

Transcultural adaptation and psychometric validation of a Spanish-language version of the “Pelvic Girdle Questionnaire”