Sleep Problems in Relation to Smoking and Alcohol Use in Chinese Adolescents.

This study examined sleep patterns and sleep problems in relation to smoking and alcohol use in Chinese adolescents. A questionnaire survey of 2090 adolescent students was conducted in Lijin County, Shandong, China. A self-administered questionnaire was used to collect the data.

[A cross-sectional study on injuries in residents from the countryside of Huanghe Delta rural areas].

Objective: To study the incidence of injuries among residents living in the countryside of Huanghe delta area.

Methods: A household questionnaire survey was conducted to 15 276 residents in 20 villages of Dongying municipality of Shandong province with a stratified-cluster sampling on their injuries from March 1, 2002 to February 28, 2003. Data were analyzed with Excel 2000 and SPSS 11.