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Convergent validity

TB Thijs Beckers
BK Bauke Koekkoek
GH Giel Hutschemaekers
BR Bridey Rudd
BT Bea Tiemens
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In order to assess convergent validity, relationships among (a) the mean score or the I.ROC or an individual item of the I.ROC, and (b) the relevant scores from the other questionnaires (as determined before the start of the study), Pearson correlation coefficients were calculated. All of the I.ROCs (except for those used in the test–retest analysis) were included. A correlation of ≥ 0.70 was used as the gold standard for identifying a cut-off score for assessing convergent validity [24]. To evaluate discriminant validity, I.ROC scores for the different age, sex, and diagnostic groups were compared using t-tests or analysis of variance (ANOVA).

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