Table I.
Sample characteristics
| Characteristic | Healthy subjects (n = 19) | OCD patients (n = 17) |
|---|---|---|
| Mean (SD), range | Mean (SD), range | |
| Age, y | 30.6 (7.2), 22–48 | 32.8 (10.8), 17–52 |
| Sex, M/F, no. | 10/9 | 8/9 |
| Handedness, right/left, No. | 19/0 | 17/0 |
| Formal education, years | 15.4 (2.6) | 14.6 (2.3) |
| Intelligence‐Verbal scale | 112.7 (10.1), 92–134 | 109.4 (6.7), 98–123 |
| Intelligence‐Performance scale | 115.1 (11.6), 93–132 | 108.4 (13.7), 83–127 |
| Intelligence‐Full scale | 115.5 (10.3), 98–130 | 109.9 (9.6), 93–126 |
| Age at onset of OCD, y | N/A | 18.0 (9.0), 3–34 |
| Duration of illness, y | N/A | 14.8 (10.9), 2–36 |
| BAI | 5.5 (5.7), 0–20 | 10.2 (9.6), 0–30 |
| BDI‐II | 6.3 (5.8), 0–17 | 9.7 (6.7), 0–21 |
| Y‐BOCS‐Total | N/A | 16.5 (5.9), 7–24 |
| Y‐BOCS‐Obsessions | N/A | 7.7 (3.6), 0–14 |
| Y‐BOCS‐Compulsions | N/A | 8.8 (2.9), 4–13 |
| OCD symptom dimensions | ||
| PI‐Obsession Thoughts | N/A | 5.5 (5.2), 0–16 |
| PI‐Obsession Impulses | N/A | 1.3 (1.9), 0–7 |
| PI‐Contamination Compulsions | N/A | 12.9 (11.0), 0–36 |
| PI‐Checking Compulsions | N/A | 17.3 (14.1), 3–40 |
| PI‐Dressing/Grooming Compulsions | N/A | 3.6 (3.4), 0–10 |
| PI‐Total | N/A | 40.6 (31.1), 6–92 |
| Medication at study time | no. | |
| Medication‐naive | N/A | 9 |
| Fluoxetine | N/A | 1 |
| Fluvoxamine | N/A | 1 |
| Citalopram | N/A | 1 |
| Clomipramine | N/A | 3 |
| Venlafaxine | N/A | 1 |
| Paroxetine | N/A | 1 |
BAI, Beck Anxiety Inventory; BDI‐II, Beck Depression; OCD, obsessive‐compulsive disorder; WAIS, Wechsler Adult Intelligence Scale; Y‐BOCS, Yale‐Brown Obsessive‐Compulsive Scale; Inventory; SSRI, selective serotonin reuptake inhibitor.
* P < .05