Risk factor | Prevalence of exposure among controls (%) | Prevalence of exposure among cases (%) | OR | Number of required study subjects |
Beef | 78 | 85 | 1.6 | 960 |
Pork | 52 | 60 | 1.4 | 1130 |
Lamb | 42 | 50 | 1.4 | 1120 |
Chicken | 80 | 87 | 1.6 | 1040 |
Offal | 2.0 | 5.0 | 2.6 | 1154 |
Puppies | 2.1 | 5.4 | 2.7 | 1040 |
80% power and α=0.05.