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The role of migration and choice of denominator on the prevalence of cerebral palsy

2013; Wiley; Volume: 55; Issue: 6 Linguagem: Inglês

10.1111/dmcn.12095

1469-8749

Kim Van Naarden Braun, Matthew J. Maenner, Deborah Christensen, Nancy Doernberg, Maureen S. Durkin, Russell S. Kirby, Marshalyn Yeargin‐Allsopp,

Family and Disability Support Research

Aim Differential migration and choice of denominator have been hypothesized to contribute to differences between period prevalence and birth prevalence of cerebral palsy ( CP ). The purpose of this study was to evaluate the effects of migration and choice of denominator on the prevalence of CP . Method Data from the M etropolitan A tlanta D evelopmental D isabilities S urveillance P rogram and census and birth certificate files were used to calculate various CP prevalence estimates for 2000. Results The overall CP period prevalence was 3.2 (95% confidence interval [ CI ] 2.7–3.8) per 1000 8‐year‐olds and was similar for those born in A tlanta who resided there at age 8 years (3.3; 95% CI 2.7–4.1) and those born outside A tlanta who moved into A tlanta by age 8 years (3.0; 95% CI 2.3–3.9). CP prevalence in these two migration strata was similar by sex and race/ethnicity. CP birth prevalence of 8‐year‐olds in A tlanta in 2000 was 2.0 (95% CI 1.6–2.5) per 1000 live births in 1992. Interpretation The authors found no evidence to support the hypothesis that differential in‐migration explained higher period than birth prevalence of CP in A tlanta. Comparability of CP prevalence across geographic areas will be enhanced if future studies report both period and birth prevalence.