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[Population attributable fraction: estimation and interpretation]
J Llorca1, C Fariñas-Álvareza, M Delgado-Rodrígueza
1Cátedra de Medicina Preventiva y Salud Pública. Facultad de Medicina. Universidad de Cantabria.
Abstract:
The goal of this paper is to revise the concept, estimation methods, and interpretations of the population attributable fraction. From the usual formula of the population attributable fraction: (Ip I₀) / Ip, where Ip is the cumulative incidence in the overall population, and I₀ is the cumulative incidence in the non-exposed group, other formulae are presented for use in exposures with more than two levels, and in the presence of confounding factors. Differences in estimation methods between cohort and case-control studies are discussed, and equations to estimate confidence intervals are displayed. Finally, some interpretations -including the concepts of «etiologic case» and «case in excess», suggested by Greenland and Robbins-, and some habitual errors are discussed.
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