Development of a state measure of obsessive compulsive behavior.

The Reaction Inventory-Interference was developed to identify obsessional thoughts and compulsive acts, which interfere with an individual's daily activities. The 50 items in the inventory were administered to 172 Ss. On the basis of item test correlations, 40 items were retained for subsequent analyses. The estimate of internal consistency for the 40 item inventory was .95. The correlation between the 40-item inventory and the "symptom" score on the Leyton Obsessional Inventory was .66. Factor analysis of the 40-item inventory yielded nine factors.