Table 1. General information of the groups.
| Information | Adolescent (≤21) | Young [22–39] | Middle-aged [40–59] | Old (≥60) |
|---|---|---|---|---|
| MDD | ||||
| Number | 39 | 116 | 69 | 11 |
| Female proportion | 77% | 74% | 71% | 73% |
| Episodicity status | First-episode | First-episode | First-episode | First-episode |
| Medication status | Drug-naïve | Drug-naïve | Drug-naïve | Drug-naïve & medicine-treatment |
| HAMD | 23.28 | 22.26 | 23.88 | 22.36 |
| HC | ||||
| Number | 39 | 115 | 70 | 11 |
| Female proportion | 72% | 74% | 71% | 73% |
MDD, major depressive disorder; HC, healthy controls; HAMD, Hamilton Depression Scale.