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Table 3 Association between daytime napping duration and 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

  Model 1 Model 2 Model 3 Model 4 Model 5
0 1(ref) 1(ref) 1(ref) 1(ref) 1(ref)
0-30 min 1.381 1.255 1.272 1.233 1.221
30-60 min 2.076* 1.888 1.920 1.956 1.959
≥ 60 min 2.138* 2.096* 2.155* 2.211* 2.253*
  1. Model 1: crude model
  2. Model 2: adjusted for age (years), sex (men and women) and body mass index (BMI)
  3. Model 3: adjusted for age (years), sex (men and women), body mass index, education level, annual income per capita of the family, physical exercise, smoking, daily sedentary time, staying-up and sleeping pill use
  4. Model 4: adjusted for age (years), sex (men and women), body mass index, education level, annual income per capita of the family, physical exercise, smoking, daily sedentary time, staying-up, sleeping pill use, total cholesterol, triglyceride, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, coronary heart disease, diabetes and hypertension
  5. Model 5: model 4 plus adjusted for nocturnal sleep duration
  6. * represents P value < 0.05