Table 1 Demographic characteristics of the remission group and the nonremission group
|  | Remission (n = 619) | Nonremission (n = 255) | χ2 | P |
|---|---|---|---|---|
Age (year) | Â | Â | 14.093 | 0.003 |
 Minor | 111 (17.9) | 29 (11.4) |  |  |
 Youth | 289 (46.7) | 109 (42.7) |  |  |
 Middle age | 145 (23.4) | 66 (25.9) |  |  |
 Old age | 74 (12.0) | 51 (20.0) |  |  |
Gender | Â | Â | 0.083 | 0.774 |
 Male | 217 (35.1) | 92 (36.1) |  |  |
 Female | 402 (64.9) | 163 (63.9) |  |  |
Marital status | Â | Â | 10.318 | 0.018 |
 Unmarried | 257 (41.5) | 79 (31.0) |  |  |
 Married | 321 (51.9) | 150 (58.8) |  |  |
 Divorced | 28 (4.5) | 19 (7.5) |  |  |
 Widowed | 13 (2.1) | 7 (2.7) |  |  |
Education | Â | Â | 2.379 | 0.304 |
 Illiterate | 29 (4.7) | 16 (6.3) |  |  |
 9-years compulsory education | 321 (51.9) | 119 (46.7) |  |  |
 High school or above | 269 (43.5) | 120 (47.1) |  |  |
BMI | Â | Â | 8.030 | 0.018 |
 < 18.5 | 20 (3.2) | 5 (2.0) |  |  |
 18.5–23.9 | 565 (91.3) | 223 (87.5) |  |  |
 ≥24 | 34 (5.5) | 27 (10.6) |  |  |
Smoking | Â | Â | 6.100 | 0.014 |
 Yes | 89 (14.4) | 54 (21.2) |  |  |
 No | 530 (85.6) | 201 (78.8) |  |  |
Alcohol use | Â | Â | 1.647 | 0.199 |
 Yes | 88 (14.2) | 45 (17.6) |  |  |
 No | 531 (85.8) | 210 (82.4) |  |  |
Diabetes |  |  | 13.863 | < 0.001 |
 Yes | 22 (3.6) | 25 (9.8) |  |  |
 No | 597 (96.4) | 230 (90.2) |  |  |
Hypertension | Â | Â | 9.169 | 0.002 |
 Yes | 43 (6.9) | 34 (13.3) |  |  |
 No | 576 (93.1) | 221 (86.7) |  |  |
Atherosclerosis |  |  | 25.586 | < 0.001 |
 Yes | 4 (0.6) | 16 (6.3) |  |  |
 No | 615 (99.4) | 239 (93.7) |  |  |
Hyperlipidemia |  |  | 13.416 | < 0.001 |
 Yes | 27 (4.4) | 28 (11.0) |  |  |
 No | 592 (95.6) | 227 (89.0) |  |  |
COPD | Â | Â | 7.893 | 0.005 |
 Yes | 12 (1.9) | 14 (5.5) |  |  |
 No | 607 (98.1) | 241 (94.5) |  |  |
Hypothyroidism | Â | Â | 4.301 | 0.038 |
 Yes | 27 (4.4) | 20 (7.8) |  |  |
 No | 592 (95.6) | 235 (92.2) |  |  |
History of anesthesia | Â | Â | 5.979 | 0.014 |
 Yes | 156 (25.2) | 85 (33.3) |  |  |
 No | 463 (74.8) | 170 (66.7) |  |  |
Family history of depression | Â | Â | 0.163 | 0.687 |
 Yes | 94 (15.2) | 36 (14.1) |  |  |
 No | 525 (84.8) | 219 (85.9) |  |  |
First-onset depression | Â | Â | 8.231 | 0.004 |
 Yes | 238 (38.4) | 72 (28.2) |  |  |
 No | 381 (61.6) | 183 (71.8) |  |  |
Duration of depression, median (IQR), months | 15 (5,48) | 36 (8,75) | 24.099a | < 0.001 |
Number of ECT, median (IQR), times | 10 (8,12) | 9 (7,12) | 28.031a | < 0.001 |