[Relations between smoking, alcohol intake, physical activity, sleeping hours and the metabolic syndrome in Chinese male aged 18 - 45 years old].

Objective: To analyze the relationship between prevalence of metabolic syndrome (MS) and behavior habits such as smoking, alcohol intake, physical activity, sleeping hours.

Methods: A multi-stage stratified cluster sampling was conducted in 31 provinces, autonomous regions, and municipalities in China according to the program of National Nutrition and Health Survey. Questionnaire survey, interview, physical examination, measurement of biochemical indices, and dietary investigation were done. In total, 4937 men aged 18 to 45 years old were selected.

Results: The MS prevalence was 6.9% (329/4937). The rate of drinking was 49.4% and smoking rate was 54.4%. The percentage of sleeping was hours from 7 to 8 was 70.5%. The percentage of spending time on physical activity over 420 minutes/week was as high as 41.9%. Data from single logistic regression showed volume of smoking more than 600 packs and alcohol intake were associated with high risk of MS and no significantly associations were found between MS and the duration of physical activity and the sleeping time. Multivariate logistic regression showed that the risk of MS in smokers with the volume more than 600 packs age increased significantly as compared to nonsmokers with the odds ratio as 1.443 (95%CI: 1.044 - 1.993) and 1.765 (95%CI: 1.150 - 2.708) in smokers with volume from 600 to 899 packs age, and more than 900 packs age respectively. Compared to the nondrinkers, the odds ratios were 1.525 (95%CI: 1.135 - 2.048), 2.322 (95%CI: 1.671 - 3.255) and 2.033 (95%CI: 1.478 - 2.796) in subjects volume of alcohol drinking as 1 to 2 times per week, 3 to 4 times per week and more than 5 times per week respectively.

Conclusion: Tobacco and alcohol were associated with high risks of MS.