[Longitudinal Cohort Study of the Relationship between Sleep Duration and Depressive Symptoms in Older People in China].

Objective: To investigate the relationship between sleep duration and depressive symptoms in older people in China, and to explore whether there are gender differences in the relationship.

Methods: Accessing the data from China Health and Retirement Longitudinal Study (CHARLS) for 2015 and 2018, we covered in the study a total of 2898 respondents, including 1684 males (58.1%) and 1214 females (41.

[Prevalence and Metabolic Abnormalities of Fatty Liver Disease among Adults in Mianyang City,Sichuan Province].

Objective To understand the prevalence and metabolic abnormalities of fatty liver disease among adults in Mianyang City,Sichuan Province,and to analyze their influencing factors.Methods Totally 294 603 adults aged 18 years and older were enrolled by using a multi-stage stratified random sampling method in Mianyang City from November 1,2014 to September 30,2015.Fatty liver was diagnosed by abdominal ultrasound.

[Awareness of Acquired Immune Deficiency Syndrome and Its Influencial Factors among College Students in Universities Implementing "Red Ribbon in Colleges" Event across China].

Objective To investigate the college students'awareness of acquired immune deficiency syndrome (AIDS) and its influencial factors in universities implementing "Red Ribbon in Colleges" event.Methods A multistage random sampling method was used to select 2057 students from 8 universities. Among them,1977 students were surveyed by quantitative questionnaires and 80 students were interviewed qualitatively.

[Prevalence of HBsAg Positive and HBsAb Negative Populations in Rural Mianyang].

Objective: To determine the prevalence of positive HBsAg and negative HBsAg populations in rural Mianyang, and provide evidence support for proper immunization strategies.

Methods: A questionnaire survey was conducted on 163 797 rural residents in Mianyang selected through a multistage random sampling strategy. Serum samples were taken from the participants to detect HBsAg and HBsAb with enzyme-linked immunosorbent assay (ELISA).