| Characteristic | MDD (n = 10) | HC (n = 21) |
| Mean (SD) | Mean (SD) | |
| Sex, female:male | 3:7 | 9:12 |
| Age, y | 48.3 (11.4) | 46.5 (11.3) |
| Education, y | 15.2 (3.0) | 14.7 (3.1) |
| Months from onset of illness | 6.7 (5.3) | NA |
| Imipramine equivalent, mg | 130 (114.5) | NA |
| HAM-D score | 16.1 (5.5) | NA |