Table 1.
Demographic and clinical variables
| HC (N = 39) | MDD (N = 139) | |
|---|---|---|
| Demographic variables | ||
| Sex, male; N (%) | 14 (36%) | 49 (35%) |
| Age (years), mean | 37.0 ± 14.6 | 37.2 ± 13.1 |
| Range | 18–65 | 18–65 |
| Race, N (%); Caucasian | 13 (33%) | 43 (31%) |
| Ethnicity, N (%); Hispanic | 3 (8%) | 22 (16%) |
| Handedness, N (%); Right | 32 (82%) | 118 (85%) |
| Education (years), mean | 15.2 ± 2.3 | 14.8 ± 2.5 |
| Range | 10–20 | 8–21 |
| Clinical variables | ||
| Age of onset of MDE, mean | — | 15.8 ± 6.2 |
| Range | 2–30 | |
| Number of MDEs, median | — | 6 |
| Range | 1–120 | |
| Length of current episode, mean | — | 37.6 ± 63.0 |
| Range (months) | 1–400 | |
| HAM‐D 17‐item*, mean | 0.7 ± 0.9 | 18.7 ± 4.5 |
| Range | 0–3 | 10–32 |
| QIDS‐SR16 *, mean | 1.4 ± 1.3 | 18.3 ± 2.8 |
| Range | 0–4 | 14–27 |
Data are presented as mean ± standard deviation unless otherwise specified.
HC, healthy control; MDD, major depressive disorder; MDE, major depressive episode; HAM‐D, Hamilton Rating Scale for Depression; QIDS‐SR16, quick inventory of depressive symptoms.
*P < .001 versus HC.