| Yale-Brown Obsessive Compulsive Scale | Goodman, Price, Rasmussen, Mazure, Fleischmann, Hill, Heninger & Charney (1989). | 10 | 1) Severity of obsessions. 2) Severity of compulsions. | Inter-rater reliability estimated to be excellent (obsessions subtotal, r = .97; compulsions subtotal, r = .96; total score, r = .98)—Foa, Kozak, Salkovskis, Coles, Amir (1998). | The total Yale-Brown Scale score was significantly correlated with two of three independent measures of obsessive-compulsive disorder and weakly correlated with measures of depression and of anxiety in patients with obsessive-compulsive disorder with minimal secondary depressive symptoms. Results from a previously reported placebo-controlled trial of fluvoxamine in 42 patients with obsessive-compulsive disorder showed that the Yale-Brown Scale was sensitive to drug-induced changes, and that reductions in Yale-Brown Scale scores specifically reflected improvement in obsessive-compulsive disorder symptoms. Together, these studies indicate that the 10-item Yale-Brown Scale is a reliable and valid instrument for assessing obsessive-compulsive disorder symptom severity, and that it is suitable as an outcome measure in drug trials of obsessive-compulsive disorder—Goodman, Price, Rasmussen, Mazure, Fleischmann, Hill, Heninger & Charney (1989). |
| Obsessive Compulsive Thoughts Checklist (OCTC) | Bouvard, Mollard, Cottraux, Guerin, (1989) | 28 | 1) Checking 2) Responsibility 3) Washing | The Cronbach coefficient of internal consistency was computed for the 28 items for each group separately. Reliability was satisfactory (OCD patients = .88; agoraphobic patients = .84 and control subjects = .89). Then the Cronbach coefficient of internal consistency was computed for each factor subscale across the three groups: - checking subscale (10 items): OCD patients = .87; agoraphobic patients = .88 and control subjects = .79. - responsibility subscale (11 items): OCD patients = .84; agoraphobic patients = .83 and control subjects = .68. - washing subscale (7 items): OCD patients = .87; agoraphobic patients = .81 and control subjects = .59— Bouvard, Cottraux, Mollard, Arthus, Lachance, Guerin, Sauteraud & Yao (1997). | Spearman rank correlations were used to compute convergent validity in a sub-group of obsessive compulsive patients (r - 96). The Obsessive Compulsive Thoughts Checklist correlated positively with the Compulsive Activity Checklist (rho - .62; p < .0001). The total score was also positively correlated with the Yale-Brown Obsessive Compulsive Scale (YBOCS total scale: rho - .42; p < .0001; YBOCS obsession scale: rho - .40; p < .0001; YBOCS compulsion scale: rho .37; p = .0002). The factor structure was studied both on the sample which included agoraphobic patients and controls (n - 141) and on the obsessive compulsive patients only (n = 122). In both analyses, three identical factors were found: - factor 1: checking/ perfectionism-orderliness - factor 2: responsibility/dread of harming others - factor 3: washing/contamination. Results support the validity and the internal consistency of the Obsessive Compulsive Thoughts Checklist—Bouvard, Cottraux, Mollard, Arthus, Lachance, Guerin, Sauteraud & Yao (1997). |