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

Table 3 Association between daytime napping duration and NAFLD

	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*

Model 1: crude model
Model 2: adjusted for age (years), sex (men and women) and body mass index (BMI)
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
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
Model 5: model 4 plus adjusted for nocturnal sleep duration
* represents P value < 0.05

ISSN: 1471-230X