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Table 1 Comparison of baseline characteristics according to NAFLD

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

Characteristics Without NAFLD (n = 3223) With NAFLD (n = 140) P value
Age, year 33 ± 8 37 ± 11 < 0.001
Male, n(%) 2053 (63.7%) 86 (61.4%) 0.585
BMI, kg/m2 22.3 ± 3.3 21.9 ± 3.2 0.174
High school above, n(%) 2632 (81.7%) 109 (77.9%) 0.323
Annual family personal income (thousand yuan)     0.601
 < 20 317 (9.8%) 15 (10.7%)  
 20–40 236 (7.3%) 12 (8.6%)  
 40–60 298 (9.2%) 16 (11.4%)  
 60–80 473 (14.7%) 16 (11.4%)  
Physical activity ≥ 1 time/week, n (%) 1230 (38.2%) 65 (46.4%) 0.06
Sleeping pills using 193 (6.0) 16 (11.4%) 0.009
Nocturnal sleeping duration/h, n(%)     0.058
 ≤ 7 h 2154 (66.8%) 103 (73.6%)  
 > 7 h 1069 (33.2%) 37 (26.4%)  
Daytime dapping duration/min, n(%)     0.043
 0 391 (12.1%) 9 (6.4%)  
 < 30 min 346 (10.8%) 11 (7.9%)  
 30-60 min 1653 (51.3%) 79 (56.4%)  
 ≥ 60 min 833 (25.8%) 41 (29.3%)  
Smoking, n(%)    0.896
 Never 2984 (92.6%) 126 (90.0%)  
 Current 141 (4.4%) 11 (7.9%)  
 Quitted 32 (1.0%) 2 (1.4%)  
 Passive 66 (2.0%) 1 (0.7%)  
Often staying up late 1751 (54.3%) 71 (50.7%) 0.377
Sedentary duration/(h per day)     0.387
 > 8 703 (21.8%) 36 (25.7%)  
Coronary disease, n (%) 22 (0.7%) 0 0.999
Diabetes, n (%) 7 (0.2%) 0 0.742
Hypertension, n (%) 64 (2.0%) 8 (5.7%) 0.007
LDL-C 3.1 (0.7) 3.2 (0.6) 0.075
Triglycerides 1.2 (0.9) 1.2 (0.9) 0.672
HDL-C 1.3 (0.2) 1.4 (0.3) 0.028
Total cholesterol 4.8 (0.9) 5.0 (0.8) 0.014
  1. BMI, body mass index; LDL-C, low-density lipoprotein cholesterol; HDL-C, high-density lipoprotein cholesterol