J Med Assoc Thai 2004; 87 (2):150

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Development of Screening Indicators for Ranking Areas at Risk of Vitamin A Deficiency in Thailand Kandavasee Maleevong, DrPH Somchai Durongdej, EdD,
Wasantawisut E Mail, Pradipasen PM , Pattaraarchachai J , Sinawat S

The objective of this study was to develop community based screening indicators for iden-
tifying areas at risk of vitamin A deficiency. Three hundred children aged 24-71 months in 12 villages
of 3 provinces who were previously identified to have various degrees of vitamin A deficiency were
randomly selected to participate in the study. These villages were located in Songkhla, Yala and
Narathiwat provinces. Data collection included anthropometric measurements, serum retinol analysis,
data on dietary intake, illness, and socioeconomic status. Subsamples of 120 children were taken for
Modified Relative Dose Response. Statistics used for data analysis were factor analysis, discriminant
analysis and Receiver Operating Characteristic curves. Sensitivity and specificity of the screening indi-
cators were calculated and compared with the rate of vitamin A deficiency
15 per cent of children
with serum retinol
0.70 Jlmol/1.
Findings revealed that the screening indicators could identify areas at risk of vitamin A defi-
ciency with 83.3 per cent efficiency. Data to be used for identifying areas at risk of vitamin A defi-
ciency included home and land ownership for agriculture, dietary intake of vitamin A, access to social
services (maternal education and antenatal care), vaccination, infectious diseases (diarrhoea and upper
respiratory tract infection with fever) and nutritional status.
Key word : Screening Indicators, Vitamin A Deficiency Disorders, Areas at Risk of Vitamin A
Deficiency, Thailand

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