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Table 2 Comparison of baseline characteristics according to different daytime napping duration

From: Positive association of nap duration with risk of non-alcoholic fatty liver disease in an occupational population in Guangdong Province, China: a cross-sectional study

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%)
  1. BMI, body mass index; LDL-C, low-density lipoprotein cholesterol; HDL-C, high-density lipoprotein cholesterol