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Adaptation and Validation of the Sexual Assertiveness Scale (SAS) in a Sample of Male Drug Users

  • Pablo Vallejo-Medina (a1) and Juan Carlos Sierra (a2)
Abstract
Abstract

The aim of the present study was to adapt and validate the Sexual Assertiveness Scale (SAS) in a sample of male drug users. A sample of 326 male drug users and 322 non-clinical males was selected by cluster sampling and convenience sampling, respectively. Results showed that the scale had good psychometric properties and adequate internal consistency reliability (Initiation = .66, Refusal = .74 and STD-P = .79). An evaluation of the invariance showed strong factor equivalence between both samples. A high and moderate effect of Differential Item Functioning was only found in items 1 and 14 (∆R2 Nagelkerke = .076 and .037, respectively). We strongly recommend not using item 1 if the goal is to compare the scores of both groups, otherwise the comparison will be biased. Correlations obtained between the CSFQ-14 and the safe sex ratio and the SAS subscales were significant (CI = 95%) and indicated good concurrent validity. Scores of male drug users were similar to those of non-clinical males. Therefore, the adaptation of the SAS to drug users provides enough guarantees for reliable and valid use in both clinical practice and research, although care should be taken with item 1.

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*Correspondence concerning this article should be addressed to Pablo Vallejo-Medina. Facultad de Psicología. Fundación Universitaria Konrad Lorenz. Carrera 9 Bis No. 62–43 Bogotá (Colombia). E-mail: pablo.vallejom@konradlorenz.edu.co
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