Table 1. Demographic and clinical characteristics for participants.
| OCD (N = 30) | SIB (N = 19) | CON (N = 30) | Analysis | ||
| Characteristic | Mean (SD) | Mean (SD) | Mean (SD) | F(df = 2, 76) | p-value |
| Age (years) | 28.0 (6.8) | 28.6 (8.5) | 27.3 (8.2) | 0.17 | 0.84 |
| Male/Female | 21/9 | 9/10 | 22/8 | 0.15 | |
| Education (years) | 13.7 (3.0) | 14.6 (2.4) | 13.3 (3.7) | 1.10 | 0.34 |
| IQ estimate | 104.2 (16.7) | 104.7 (14.8) | 107.2 (15.7) | 0.30 | 0.74 |
| Age at onset of OCD (years) | 19.5 (5.5) | ||||
| Duration of illness (years) | 8.6 (5.5) | ||||
| Y-BOCS (total) | 27.7 (6.2) | 3.8 (3.7) | 2.0 (2.7) | 279.80 | < 0.01 |
| Y-BOCS (obsessions) | 15.7 (3.5) | 1.7 (1.9) | 0.9 (1.2) | 315.46 | < 0.01 |
| Y-BOCS (compulsions) | 12.0 (4.9) | 2.2 (2.2) | 1.1 (1.9) | 88.80 | < 0.01 |
| OCI-R | 21.9 (12.2) | 9.0 (6.6) | 10.3 (9.3) | 13.73 | < 0.01 |
| BDI | 17.0 (13.7) | 3.5 (7.4) | 7.2 (8.0) | 11.54 | < 0.01 |
| STAI (state) | 49.9 (17.7) | 29.1 (15.1) | 34.5 (18.1) | 10.08 | < 0.01 |
| STAI (trait) | 52.1 (16.8) | 29.4 (17.6) | 34.1 (17.8) | 12.44 | < 0.01 |
Abbreviations: BDI, Beck Depression Inventory; CON, healthy control subjects; OCD, patients with Obsessive-Compulsive Disorder; OCI-R, Obsessive-Compulsive Inventory-Revised; SD, Standard Deviation; SIB, siblings of individuals with OCD; STAI, State-Trait Anxiety Inventory; Y-BOCS, Yale-Brown Obsessive-Compulsive Scale.