From: Bias magnification in ecologic studies: a methodological investigation
 | Group 0 | Group 1 | Crude | ||||||
---|---|---|---|---|---|---|---|---|---|
 | expose | unexposed | sum | expose | unexpose | sum | expose | unexpose | sum |
case | 16 | 12 | 28 | 48 | 24 | 72 | 64 | 36 | 100 |
noncase | 24 | 48 | 72 | 12 | 16 | 28 | 36 | 64 | 100 |
total | 40 | 60 | 100 | 60 | 40 | 100 | 100 | 100 | 200 |
risk | 0.40 | 0.20 | Â | 0.80 | 0.60 | Â | 0.64 | 0.36 | Â |
RD | 0.20 | Â | Â | 0.20 | Â | Â | 0.28 | Â | Â |
X i | 0.40 | Â | Â | 0.60 | Â | Â | Â | Â | Â |
Y i | 0.28 | Â | Â | 0.72 | Â | Â | Â | Â | Â |
n i | 100 | Â | Â | 100 | Â | Â | Â | Â | Â |