ORIGINAL ARTICLESRefractive error study in children: sampling and measurement methods for a multi-country survey☆
Section snippets
Methods
General economic status and ethnic composition in common with a major segment of the population, familiarity with health and other authorities in the community, and geographic proximity to the study institution were considered in identifying the specific target population within each country. Population-based, cross-sectional samples of the target population were selected through random sampling of children ages 5 through 15 years. For logistical practicality, cluster sampling with
Discussion
Sampling was carried out in such a way that each child living within the target population had an equal chance of being selected for inclusion in the survey. The size of the cluster within which the child resided did not influence the chance of being selected. Drawing the sample from children in schools, instead of from geographically defined populations, would not have produced population-based estimates of refractive error—not just because some children may not be attending school, but the
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Cited by (0)
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This study was supported by the World Health Organization under National Institutes of Health Contract N01-EY-2103, Bethesda, Maryland.