Invarianza por sexo y distribución del Índice de Satisfacción Sexual reducido en una muestra mexicana de rutas aleatorias.

Objective: Hudson's Index of Sexual Satisfaction is a one-dimensional sexual satisfaction measure, used for research and clinical practice. In Mexico, 10 items form (ISS-10) has been proposed. This research aims to provide new evidences related to cross-validity (among women and men) and convergent validity of ISS-10 form, describing distribution, and study and also its relationship with six socio-demographic variables. Method: An instrumental research was performed. ISS-10, Relationship Rating Scale (RAS), Marital Aggrandizement Scale (MAS) and three other scales were applied; 807 married or cohabiting people were randomly sampled from Monterrey, Mexico between January and May 2014. Multi-confirmatory factorial group analysis was applied for data analysis. Results: The factor model has 10 indicators that show invariance among women and men. ISS-10 scores did not follow a normal distribution. In the overall sample, ISS-10 correlated with relationship satisfaction (RAS) was very high (rS = .71), and with the marital aggrandizement (MAS) also was high (rS = .56). Age, years of marriage or cohabitation and years of schooling have low correlation with ISS-10 form (rS from .13 to .27). Sex and marital status were independent based on ISS-10. Conclusion: The Index of Sexual Satisfaction, considered as key-factor to measure sexual satisfaction was reduced to 10 indicators, showing that the validity of evidence, is independent of being male or female, and it can be scaled using percentile scores rank. [ABSTRACT FROM AUTHOR]