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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