Fig. 1. The three factors revealed from a dimension reduction analysis performed on self-report estimates.

A Factor loadings showed that obsessional thinking loaded primarily on the first factor, along with depression, anxiety, and worry subscales. The compulsive behavior subscale primarily loaded on the second factor, and schizotypal tendencies predominantly loaded on the third factor. B Illustration of the association between the compulsive factor and individual items from the self-report measures. The x axis on all four scatter plots indicates the latent score for each individual on the compulsivity factor. The y axis illustrates the subscale score of a single estimate including (from left to right): (I) Compulsive washing (the average rating across the ten items of the washing subscale in the PI-WSUR questionnaire; an example item is, “I wash my hands more often and longer than necessary.”). (II) Compulsive checking (the average rating across the ten items of the checking subscale in the PI-WSUR questionnaire; an example item is, “I tend to keep on checking things more often than necessary”). (III) Compulsive ordering behavior (the average rating across the three items of the ordering subscale in the OCI-R questionnaire; an example item is, “I get upset if objects are not arranged properly”). (IV) Compulsive dressing/grooming (the average rating across the three items of the grooming subscale in the PI-WSUR questionnaire; an example item is, “I feel obliged to follow a particular order in dressing, undressing, and washing myself”).