[A Cross-sectional Study of Hepatitis B Virus Infection in Mianyang, Sichuan Province].

OBJECTIVES: To determine the prevalence and distribution of hepatitis B virus (HBV) infection in Mianyang. METHODS: Data were extracted from the 12th five-year National Science and Technology Major Projects-Integrated Prevention and Control of Major Infectious Diseases in Mianyang. A two-level logistic regression model was established to determine factors associated with HBV infection. RESULTS: About 4.91% of people in Mianyang were HBsAg positive, which increased with age. HBV infection showed aggregation at townships. Governmental spending ≥¥1 000 000 on public health was a protective factor in the regression model; whereas, age, male gender, medical workers, absent from HBV vaccination, more than 80 g/d alcohol consumption were risk factors of HBV infection. CONCLUSIONS: Mianyang had medium level of HBV infections. But high HBV prevalence can be found in some townships. The known behavior risk factors all exist in Mianyang, which can serve as a screening tool for identifying high risk populations.

[Sleep Duration and Abdominal Obesity in Elderly in China].

OBJECTIVE: To determine the relationship between sleep duration and abdominal obesity in elderly in china. METHODS: Data were drawn from the 2013 China Health and Retirement National Investigation (China Health and Retirement Longitudinal Study, CHARLS). The prevalence of abdominal obesity in the elderly who had a normal range of sleep duration was compared with those who had a shorter or longer sleep duration using Chi-square tests and binary logistic regression models. RESULTS: Higher odds of abdominal obesity were found in the elderly male with a shorter (OR=1.627, 95%CI: 1.286-2.060, P<0.05) or longer (OR=1.499, 95%CI: 1.009-2.228, P<0.001) sleep duration, compared with those with a normal range of sleep duration. Statistical significances were found in the prevalence of abdominal obesity among those with different characteristics in education, smoking, chronic conditions, and social participation. CONCLUSION: Both long and short sleep durations are associated with increased risk of obesity, which is more evident in older men. Bad living habits and mental state will increase the risk of abdominal obesity.