Table 2. Comparison of sleep-deprivation and non-sleep-deprivation groups among healthy college students in China.
| Sleep deprivation (N = 1,620) | Non-sleep deprivation (N = 522) | Z or χ2 | P value | |
|---|---|---|---|---|
| Age (median (IQR))a | 19.0 (17.0∼20.0) | 19.0 (18.0∼20.0) | −3.944 | 0.000*** |
| BMI (median (IQR))a | 21.0 (19.1∼23.7) | 21.0 (19.0∼23.4) | −0.935 | 0.350 |
| Education level (n(%))b | 4.998 | 0.082 | ||
| Junior college | 967 (59.7) | 305 (58.4) | ||
| College | 571 (35.2) | 177 (33.9) | ||
| Postgraduate | 82 (5.1) | 40 (7.7) | ||
| Grade (n (%))b | 9.442 | 0.088 | ||
| Freshman year | 696 (43.0) | 219 (42.0) | ||
| Sophomore year | 547 (33.8) | 155 (39.7) | ||
| Junior year | 212 (13.1) | 73 (14.0) | ||
| Senior year | 58 (3.6) | 22 (4.2) | ||
| University grade five | 25 (1.5) | 13 (2.5) | ||
| Postgraduate grade | 82 (5.1%) | 40 (7.7%) | ||
| Gender (n (%))b | 0.709 | 0.400 | ||
| Male | 441 (27.2) | 152 (29.1) | ||
| Female | 1179 (72.8) | 370 (70.9) | ||
| Marital status (n(%))b | 0.004 | 0.952 | ||
| Single | 1604 (99.0) | 517 (99.0) | ||
| Married | 16 (1.0) | 5 (1.0) | ||
| Nationality (n(%))b | 3.274 | 0.783 | ||
| Han | 1,547 (95.5) | 501 (96.0) | ||
| Hui | 24 (1.5) | 11 (2.1) | ||
| Manchu | 6 (0.4) | 2 (0.4) | ||
| Yi ethnic group | 6 (0.4) | 2 (0.4) | ||
| Mongolian | 6 (0.4) | 1 (0.2) | ||
| Tujia | 6 (0.4) | 1 (0.2) | ||
| Others | 25 (1.5) | 4 (0.8) | ||
| Smoking (n(%))b | 0.201 | 0.654 | ||
| No | 1,587 (98.0) | 513 (98.3) | ||
| Yes | 33 (2.0) | 9 (1.7) | ||
| If smoking, the number of cigarettes smoked per day (median (IQR))a | 5 (1.0∼7.0) | 4 (3.0∼14.0) | 0.402 | 0.695 |
| Drinking (n(%))b | 0.749 | 0.387 | ||
| No | 1,430 (88.3) | 468 (89.7) | ||
| Yes | 190 (11.7%) | 54 (10.3%) | ||
| If drinking, frequency of drinking ((n, %))b | 4.037 | 0.123 | ||
| Once a month | 133 (70.0%) | 38 (70.4%) | ||
| 2–4 times per month | 55 (28.9%) | 13 (24.1%) | ||
| 2–3 times per week | 2 (1.1%) | 3 (5.6%) | ||
| If drinking, the amount of drunk in a day (n (%))b | 6.323 | 0.157 | ||
| 1 or 2 cup | 133 (70.0%) | 37 (68.5%) | ||
| 3 or 4 cup | 35 (18.4%) | 5 (9.3%) | ||
| 5 or 6 cup | 9 (4.7%) | 6 (11.1%) | ||
| 7–9 cup | 5 (2.6%) | 2 (3.7%) | ||
| ≥10 cup | 8 (4.2%) | 4 (7.4%) | ||
| Nap duration (n(%))b | 21.601 | 0.000*** | ||
| 0∼15 min | 459 (28.3) | 121 (23.2) | ||
| 16∼30 min | 728 (44.9) | 225 (43.1) | ||
| 31∼60 min | 378 (23.3) | 136 (26.1) | ||
| >60 min | 55 (3.4) | 40 (7.7) | ||
| Sleep duration on workdays and rest days (n (%))b | 6.398 | 0.040* | ||
| Same | 513 (31.7) | 172 (33.0) | ||
| Workdays > Rest days | 149 (9.2) | 66 (12.6) | ||
| Rest days > Workdays | 958 (59.1) | 284 (54.4) |
Notes.
a
Mann–Whitney U test.
b
Chi-square test.
- IQR
- interquartile range
*
P < 0.05.
***
P < 0.001.