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[A sampling plan for evaluation of vaccinal coverage].

E P Silva, N Nakao, E Juarez

    Revista De Saude Publica
    |April 1, 1989
    PubMed
    Summary
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    This study details a 1983 vaccination coverage survey in Araraquara County, Brazil, using a modified World Health Organization sampling method for children aged 12-13 months.

    Area of Science:

    • Epidemiology
    • Public Health
    • Biostatistics

    Context:

    • Estimating vaccination coverage is crucial for public health planning and disease prevention.
    • The 1983 survey in Araraquara County, Brazil, aimed to assess immunization rates in young children.
    • The study targeted children aged 12-13 months, a key demographic for childhood immunizations.

    Purpose:

    • To describe a sampling project designed to estimate vaccination coverage in Araraquara County.
    • To detail the application of R.H. Henderson and T. Sundaresan's method for the Expanded Programme on Immunization (EPI).
    • To present the ratio-estimate as the estimator for vaccination coverage rate and its standard error calculation.

    Summary:

    • A stratified sampling approach was used, dividing the target population into children in private and collective dwellings.

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  • R.H. Henderson and T. Sundaresan's method, adapted for urban and rural zones, involved probability proportional to size selection of areas, blocks, and households.
  • A sample was drawn from both strata using the same sampling fraction, with a ratio-estimate proposed for coverage rate calculation.

    • Impact:

    • The described methodology provides a framework for conducting similar vaccination coverage surveys in other regions.
    • Accurate estimation of vaccination coverage is essential for identifying immunization gaps and informing public health interventions.
    • The study contributes to the understanding of sampling techniques applicable to immunization programs in developing countries.