Table 1 Characteristics of Chinese college students by sex a
|  | Total (n = 926) | Male (n = 308) | Female (n = 618) | P value |
|---|---|---|---|---|
Mean (SD) | ||||
 Age, years | 19.78 (1.14) | 19.95 (1.22) | 19.69 (1.09) | 0.001* |
 BMIb, kg/m2 | 21.04 (2.90) | 22.14 (3.19) | 20.49 (2.58) | < 0.001* |
 STc, h | 7.51 (2.66) | 7.26 (2.79) | 7.63 (2.59) | 0.045* |
 Sleep duration, h | 8.23 (0.84) | 8.20 (0.93) | 8.24 (0.79) | 0.411 |
 PCSd | 50.00 (8.10) | 50.58 (8.17) | 49.71 (8.06) | 0.123 |
 MCSe | 50.00 (9.53) | 50.45 (10.30) | 49.78 (9.13) | 0.316 |
N (%) | ||||
 Grade |  | 0.373 | ||
 First | 166 (17.9) | 58 (18.8) | 108 (17.5) |  |
 Second | 463 (50.0) | 144 (46.8) | 319 (51.6) |  |
 Third | 297 (32.1) | 106 (34.4) | 191 (30.9) |  |
Specialty | Â | 0.742 | ||
 Clinical | 620 (67.0) | 204 (66.2) | 416 (67.3) |  |
 Non-clinical | 306 (33.0) | 104 (33.8) | 202 (32.7) |  |
Home location | Â | 0.619 | ||
 Urban | 531 (57.3) | 174 (56.4) | 357 (57.8) |  |
 Town | 210 (22.7) | 67 (21.8) | 143 (23.1) |  |
 Rural | 185 (20.0) | 67 (21.8) | 118 (19.1) |  |
Monthly living expenses, yuan/month | 0.467 | |||
 ≤1,000 | 264 (28.5) | 93 (30.2) | 171 (27.7) |  |
 1,001–1,500 | 458 (49.5) | 154 (50.0) | 304 (49.2) |  |
 > 1,500 | 204 (22.0) | 61 (19.8) | 143 (23.1) |  |
PA f | Â | 0.010* | ||
 Low | 120 (13.0) | 36 (11.7) | 84 (13.6) |  |
 Moderate | 369 (39.8) | 105 (34.1) | 264 (42.7) |  |
 High | 437 (47.2) | 167 (54.2) | 270 (43.7) |  |