Table 2 Comparison of baseline characteristics according to different daytime napping duration
Group(n) | Daytime napping duration | |||
|---|---|---|---|---|
0 min (400) | 1-29 min (357) | 30-59 min (1732) | ≥ 60 min (874) | |
Age, year | ||||
≤ 30 | 202 (50.5%) | 139 (38.9%) | 624 (36.0%) | 384 (43.9%) |
30–40 | 131 (32.8%) | 145 (40.7%) | 702 (40.5%) | 342 (39.1%) |
40–50 | 53 (13.3%) | 54 (15.1%) | 314 (18.1%) | 110 (12.6%) |
> 50 | 14 (3.5%) | 19 (5.3%) | 92 (5.4%) | 38 (4.4%) |
Male, n (%) | 278 (69.5%) | 250 (70.0%) | 1114 (64.3%) | 497 (56.9%) |
BMI, kg/m2 | ||||
< 18.5 | 44 (11.0%) | 44 (12.3%) | 163 (9.4%) | 95 (10.9%) |
18.5–23.9 | 252 (63.0%) | 232 (65.0%) | 1053 (60.8%) | 509 (58.2%) |
≥ 24 | 104 (26.0%) | 81 (22.7%) | 516 (29.8%) | 270 (30.9%) |
High school above, n(%) | 256 (64.0%) | 343 (96.1%) | 1413 (81.6%) | 729 (83.4%) |
Annual family personal income( thousand yuan/person) | ||||
< 20 | 50 (12.5%) | 47 (13.2%) | 163 (9.4%) | 76 (8.7%) |
20–40 | 45 (11.3%) | 25 (7.0%) | 123 (7.1%) | 59 (6.8%) |
40–60 | 47 (11.7%) | 29 (8.1%) | 156 (9.0%) | 86 (9.8%) |
60–80 | 72 (18.0%) | 48 (13.4%) | 239 (13.8%) | 134 (15.3%) |
Physical activity ≥ 1time/week, n (%) | 124 (31.0%) | 129 (36.1%) | 669 (38.6%) | 376 (43.0%) |
Sleeping pills using, n(%) | 26 (6.5%) | 26 (7.3%) | 103 (5.9%) | 54 (6.2%) |
Nocturnal sleep duration > 7 h, n(%) | 136 (34.0%) | 95 (26.6%) | 535 (30.9%) | 340 (38.9%) |
Non-smoker, n (%) | 372 (93.0%) | 330 (92.4%) | 1604 (92.6%) | 803 (91.9%) |
Often staying up late | 218 (54.5%) | 195 (54.6%) | 970 (56.0%) | 449 (51.4%) |
Sedentary duration/ (h per day) | ||||
> 8 | 80 (20.0%) | 100 (28.0%) | 407 (23.5%) | 156 (17.8%) |
Coronary disease, n (%) | 3 (0.8%) | 1 (0.3%) | 13 (0.7%) | 5 (0.6%) |
Diabetes, n (%) | 0 | 0 | 7 (0.4%) | 0 |
Hypertension, n (%) | 6 (1.5%) | 5 (1.4%) | 40 (2.3%) | 21 (2.4%) |
Total cholesterol | 4.8 (0.9) | 4.8 (0.9) | 4.8 (0.9) | 4.8 (0.8) |
LDL-C | 3.0 (0.7) | 3.0 (0.7) | 3.1 (0.7) | 3.1 (0.6) |
Triglycerides | 1.2 (0.8) | 1.2 (0.9) | 1.2 (0.9) | 1.2 (1.0) |
HDL-C | 1.4 (0.3) | 1.4 (0.3) | 1.4 (0.2) | 1.4 (0.2) |
Outcomes | ||||
NAFLD | 9 (2.3%) | 11 (3.1%) | 79 (4.5%) | 41 (4.7%) |