Validity and reliability of the brazilian public service vaccination room evaluation scale according to users

The objective was to evaluate the quality of the Vaccine Room Evaluation Scale according to Users - EASV-U. A methodological study was conducted, using data from a cross-sectional study to validate the construct, estimation of internal consistency and interpretability of the EASV-U. In the 2015-2016 period, 1,300 users of the vaccine rooms were interviewed. The procedures used for construct validation were: exploratory and confirmatory factor analyses. Internal consistency was estimated using Cronbach’s Alpha Coefficient. The interpretability was presented after estimating the mean and minimum and maximum values of the EASV-U, followed by the categorization of the different factors identified, considering the lower limit of the confidence interval as the cutoff point. The EASV-U presented KMO=0.94 and Bartlett p=0.000, with grouping of 11 items into 3 factors. The EASV-U showed satisfactory internal consistency, with global Cronbach’s alpha equal to 0.949 and 0.876, 0.920 and 0.867 for factors I, II and III, respectively. The EFA legitimized the tri-factorial model of the EASV-U with the indices indicative of the adjusted model: χ²/df=4.33; RMSEA=0.05 (90% CI=0.042-0.60); CFI=0.991; TLI=0.984; GFI=0.981. The EASV-U presented good performance, with adequate psychometric properties, construct validity, internal consistency, easy application and interpretability.