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Reliability, structure and factorial congruence of the State Impulsivity Scale (SIS) in men of an HIV specialised clinic in Mexico City
ResumenIntroduction: State Impulsivity (SI) is a tendency to respond quickly in an unanticipated and unplanned fashion to specific environmental situations. In the HIV population, it is important to detect pathological SI to predict treatment adherence and risk of reinfections. Today there are questionnaires like Barratt or Plutchik scales, but these consider impulsivity as psychopathic behaviours rather than a personality feature [1Á3]. These SI instruments have not been validated in Mexican population. Therefore, we obtained the internal consistency, construct validity and factorial congruence of the State Impulsivity Scale (SIS) in Mexican men with HIV . Materials and methods: We conducted a cross-sectional study in 488 HIV-positive men (35.4912.4 years old, 12.793.6 years of education and 5.695.0 years of diagnosis). After signing informed consent, participants completed the SIS and demographic data. The analysis of SIS psychometric properties was made using standard procedures: reliability with Cronbach’s coefficient and the inter-item correlations to define the rotation method for the factor analysis. The item’s lowest limit load to be included was 0.40. The factorial congruence between the two factorial loads (original version and this study) was tested with Wrigley and Nauhaus coefficient. The statistical analysis was performed in SPSS v. 20, considering pB0.01 significant . Results: Internal consistency analysis obtained a mean Cronbach’s alpha of 0.92. Using factor analysis with oblique rotation (mean inter-item correlations r 00.71, KMO00.93), we found two factors: attentional-automatism and gratification (17 of 20 items). These factors explained 42.1 and 6.9% of the variance, respectively. The subsequent analysis of internal consistency indicated a total coefficient of 0.84 to 0.91 for each factor. The factorial congruence coefficients between the two versions of SIS (original and adapted) ranged from 0.598 to 0.971 (Table 1). Conclusions: We demonstrate that the adapted version of SIS for Mexican population is reliable, valid and conceptually equivalent or patients with HIV. The coefficients obtained were higher than those obtained in the original Spanish version. The SIS is useful for measuring impulsivity factors related to the therapeutic adherence and reinfection risk (e.g. drug use and unsafe sexual practices) reported in other studies. (Extraído del documento)
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- Póster presentado en el congreso HIV Drug Therapy 2015 Americas, celebrado en México del 16 al 18 de abril de 2015.