Participant demographic characteristics at the time of scanning
| Patients with OCD* n = 23 | Healthy controls n = 23 | p value† | |
|---|---|---|---|
| Age, yr, mean ± SD | 15.1 ± 2.6 | 14.2 ± 3.1 | 0.28 |
| Male, n (%) | 9 (39%) | 7 (30%) | 0.76 |
| Right-handed, n (%) | 22 (96%) | 20 (87%) | 0.61 |
| IQ, points, mean ± SD‡ | 105.38 ± 9.42 | 114.11 ± 13.98 | 0.09 |
| Tanner stage, mean ± SD§ | |||
| Primary | 3.5 ± 1.2 | 3.2 ± 1.2 | 0.49 |
| Secondary | 3.6 ± 1.2 | 3.1 ± 1.5 | 0.29 |
OCD = obsessive–compulsive disorder; SD = standard deviation.
↵* Among the participants with OCD, 11 described themselves as “white,” 1 participant described themselves as “Aboriginal” and 1 described themselves as “other”; the remaining participants chose not to provide their race or ethnicity. Racial or ethic information was not captured for the healthy control group.
↵† Independent-samples t test (2-tailed) for continuous measures. We assumed equal variances, because Levene’s test was not significant in any instance (p > 0.05). Fisher exact test (2-tailed) for dichotomous measures.
† Data available for 13 patients with OCD and 9 healthy controls.
↵§ Data available for 21 patients with OCD and 22 healthy controls.