[Gestational weight gain and its relationship with the birthweight of offspring].

Objective: To explore the appropriate weight gain during pregnancy and its relationship with the birthweight of offspring.

Methods: A total of 16 460 healthy pregnant women who delivered in Beijing Obstetrics and Gynecology Hospital and Haidian Maternity and Child Health Care Hospital in 2010 were recruited. All are singleton pregnancies.

[Prevalence of overweight and obesity among children and adolescents in Beijing in 2004].

Objective: To determine the current prevalence of overweight and obesity among children and adolescents (2-18 years) in Beijing and its distribution by age, gender and urban-rural residence.

Methods: As part of the Beijing Child and Adolescent Metabolic Syndrome Study, a stratified cluster representative sample of 23,422 children aged 0-18 years was selected. Anthropometric measures including weight and height were collected from 21,198 subjects aged 2-18 years from April to October in 2004.

[A cross-sectional study on prevalance and risk factors of disabilities in aged 0-6 years children in Beijing, China].

Objective: To explore the epidemiological status of disabilities on vision impairment (VI), hearing loss (HL), mental retardation (MR), autism spectrum disorder (ASD) and motor disorder (MD) in aged 0-6 years old children in Beijing.

Methods: A total of 28 738 children under 7 years old were recruited from permanent residents of Beijing City by 2-phase cluster sampling. The screening procedure was 2-phase, and the diagnosis criteria were developed by the experts group.

[Blood lead level and related risk factors among children aged 0-6 years in Beijing].

Objective: To observe blood lead level and related risk factors among children of 0 - 6-year old in Beijing.

Methods: Stratified-clustered-random sampling and simple random sampling were used. A total of 2 262 children of 0 - 6 years old were investigated from May to July 2001.