Cross-cultural validity of the Yale-Brown Obsessive Compulsive Scale

Some psychometric properties of an adaptation of the Yale-Brown Obsessive Compulsive Scale for use in the Netherlands (Y-BOCS-NL) were examined in 65 psychiatric inpatients. The factorial invariance of two-dimensional systems were determined, namely Severity and Disturbance versus Obsessions and Compulsions, with the latter performing substantially better than the former in different respects. All further analyses were therefore focused on the Obsessions and Compulsions prototype. Inter-rater agreement was established in four inpatients by 39 raters at different institutions and found to be excellent. Internal consistency was also excellent. Concurrent and divergent validity were examined and established by correlating the Y-BOCS-NL with the Padua Inventory, the Burns Perfectionism Scale and state and/or trait measures of, among others, hostility, anxiety, depression, irrational fears and assertiveness. The Obsessions and Compulsions dimensions were lowly intercorrelated and showed evidence of clearly different patterns of correlations with external measures (divergent validity).