[Prevalence of vitamin A deficiency in children under six years of age in Tibet, China].

Objective: To understand the prevalence of vitamin A deficiency (VAD) among children under six years of age in Tibet, China.

Methods: Totally, 1 257 children under six years of age were selected from two cities, two farming counties, two semi-farming counties and two livestock farming counties with stratified cluster sampling to asses VAD status in Tibet. Family information, children's feeding and disease history in the previous two weeks were collected by questionnaire.

[Survey on vitamin A deficiency in children under-6-years in China].

Objective: To understand the prevalence and spatial distribution of vitamin A deficiency (VAD) in China among children at ages under six years.

Methods: About 8,600 children under 6 years of age in 14 cities and 28 counties of 14 provinces were selected with stratified cluster sampling for survey, including interview with questionnaire for their family information and nutritional status. Blood specimens were collected for measuring serum level of VA with fluorescent spectrophotometry in laboratory.

Prevalence of subclinical vitamin A deficiency and its affecting factors in 8 669 children of China.

Objective: The survey will reveal current status of subclinical vitamin A deficiency (SVAD) and explore its affecting factors in children of China.

Methods: Totally 8 669 children aged under 6 years were randomly selected from 14 provinces for clinical examination, health and dietary questionnaire and serum level of vitamin A measurement with fluorescence method. The cut-off value for SVAD was defined as View Article and Find Full Text PDF