Table 4 Consideration of a neutral exposure category
| Â | Nonexposed E0 (e.g. normal weight, R) | Exposed Categories E1...Ei...Ek (e.g. overweight and obese, O) | Neutral Category (e.g. underweight, Q) | Total |
|---|---|---|---|---|
Death D | (1 - Σfi-fq) p0 | Σfi Ri p0 | fq pq | p |
No death | (1 - Σfi- fq) (1 - p0) | Σfi(1- Ri p0) | fq(1-pq) | 1 - p |
Total | 1 - Σfi-fq | Σfi | fq | 1 |
- Let
- f0 = fraction of population nonexposed = 1 -Σfi - fq
- fq = fraction of population underweight
- It follows that when a neutral category is involved
-
