Epidemiologic Perspectives & Innovations

Table 3 Distributions according to death and an exposure variable: Polytomous exposure

From: Population attributable fraction: comparison of two mathematical procedures to estimate the annual attributable number of deaths

	Nonexposed E₀	Exposed Categories E₁...E_i...E_k	Total
Death D	(1 - Σf_i) p₀	Σ f_i R_i p₀	P
No death	(1 - Σf_i) (1-p₀)	Σ f_i (1- R_i p₀)	1-p
Total	1 - Σf	Σf_i	1

Let
f_i = fraction of population exposed to exposure category i
R_i = relative risk for exposure category i compared to non exposed
It follows that for a polytomous exposure variable

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