The psychometric properties were evaluated with exploratory and confirmatory factor analysis. The original factor model was compared with factor models as indicated by results of exploratory factor analysis.
Próffræðilegir eiginleikar voru metnir með leitandi þáttagreiningu og einnig staðfestandi þáttagreiningu þar sem upprunalegt þáttalíkan var borið saman við þáttalausnir úr leitandi þáttagreiningu.