文章基本信息

标题：Identifying areas with vitamin A deficiency: the validity of a semiquantitative food frequency method.
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作者：N L Sloan ; D Rosen ; T de la Paz 等
期刊名称：American journal of public health
印刷版ISSN：0090-0036
出版年度：1997
卷号：87
期号：2
页码：186-191
出版社：American Public Health Association
摘要：OBJECTIVES: The prevalence of vitamin A deficiency has traditionally been assessed through xerophthalmia or biochemical surveys. The cost and complexity of implementing these methods limits the ability of nonresearch organizations to identify vitamin A deficiency. This study examined the validity of a simple, inexpensive food frequency method to identify areas with a high prevalence of vitamin A deficiency. METHODS: The validity of the method was tested in 15 communities, 5 each from the Philippines, Guatemala, and Tanzania. Serum retinol concentrations of less than 20 micrograms/dL defined vitamin A deficiency. RESULTS: Weighted measures of vitamin A intake six or fewer times per week and unweighted measures of consumption of animal sources of vitamin A four or fewer times per week correctly classified seven of eight communities as having a high prevalence of vitamin A deficiency (i.e., 15% or more preschool-aged children in the community had the deficiency) (sensitivity = 87.5%) and four of seven communities as having a low prevalence (specificity = 57.1%). CONCLUSIONS: This method correctly classified the vitamin A deficiency status of 73.3% of the communities but demonstrated a high false-positive rate (42.9%).