Table 2:
Clinical Characteristics of the ABCD Sample
| Full Sample (N=11876) | OCD Absent (n=10584) | OCD Present (n=1099) | Group Difference | Effect Size | |
|---|---|---|---|---|---|
| CBCL T-score | |||||
| DSM Anxiety | 53.49 (6.13) | 52.89 (5.35) | 59.21 (9.29) | t=22.16 | d=0.83 |
| DSM Depression | 53.6 (5.73) | 53.13 (5.21) | 58.19 (8.02) | t=20.45 | d=0.75 |
| Thought Problems | 53.8 (5.9) | 53.13 (5.14) | 60.19 (8.45) | t=27.17 | d= 1.01 |
| DSM ADHD | 53.23 (5.64) | 52.79 (5.13) | 57.55 (8.04) | t= 19.18 | d=0.71 |
| Internalizing | 48.45 (10.64) | 47.46 (10.12) | 57.88 (10.8) | t=30.58 | d=1.00 |
| Externalizing | 45.73 (10.33) | 44.98 (9.92) | 52.94 (11.41) | t=22.25 | d=0.75 |
| Total | 45.85 (11.34) | 44.78 (10.78) | 56.17 (11.4) | t=31.63 | d=1.03 |
| K-SADS lifetime diagnosis | |||||
| Any Depressive Disorder | 1272 (10.9%) | 1014 (9.61%) | 247 (22.6%) | χ2=171.62 | OR=2.75 |
| MDD | 614 (5.27%) | 475 (4.5%) | 137 (12.53%) | χ2=126.64 | OR=3.04 |
| Dysthymia | 24 (0.21%) | 18 (0.17%) | 6 (0.55%) | χ2=5.17 | OR=3.23 |
| Depression NOS | 697 (5.97%) | 570 (5.4%) | 117 (10.7%) | χ2=49.19 | OR=2.10 |
| Any Anxiety Disorder | 1730 (14.83%) | 1307 (12.39%) | 419 (38.23%) | χ2=523.32 | OR=4.38 |
| Separation Anxiety | 1047 (8.95%) | 783 (7.4%) | 263 (23.93%) | χ2=331.82 | OR=3.94 |
| Social Anxiety | 619 (5.31%) | 477 (4.52%) | 140 (12.8%) | χ2=133.59 | OR=3.10 |
| GAD | 579 (4.96%) | 382 (3.62%) | 195 (17.81%) | χ2=420.87 | OR=5.76 |
| ADHD | 2428 (20.76%) | 1921 (18.15%) | 506 (46.04%) | χ2=468.92 | OR=3.85 |
| ODD/CD | 1782 (15.24%) | 1397 (13.2%) | 385 (35.03%) | χ2=365.45 | OR=3.55 |
| PTSD | 231 (1.98%) | 141 (1.33%) | 90 (8.19%) | χ2=238.01 | OR=6.60 |
| No diagnoses | 7348 (61.99%) | 6898 (65.17%) | 296 (26.93%) | χ2=613.74 | OR=0.20 |
| Unmedicated | 10739 (90.43%) | 9704 (91.69%) | 859 (78.16%) | χ2=208.52 | OR=0.32 |
Note. Clinical characteristics of the sample are summarized here for the full ABCD baseline sample and split by the presence/absence of a lifetime K-SADS OCD diagnosis. Continuous and categorical variables are characterized respectively by mean and (standard deviation) or N and (percent) with group differences based on OCD diagnosis presence are compared by t-test (Cohen’s d effect size) or chi-squared test (odds ratio [OR] effect size). All group differences were p<.001 significant, except for dysthymia (p=.02). No diagnoses indicated that none of the listed disorders were diagnosed past or present on the K-SADS.
N=193 missing K-SADS OCD diagnosis. Additionally, n=10 missing CBCL T-scores, n=42 missing MDD and Dysthymia, n=40 missing Depression NOS, n=41 missing Social Anxiety, n=40 missing GAD.