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Data illustrative of selection bias, due to conditioning on a collider
| Influenza |
|||||
|---|---|---|---|---|---|
| Yes | No | Total | Risk | Risk difference | |
| Panel A | |||||
| Sandwich | |||||
| Chicken | 5 | 45 | 50 | 0.1 | 0.0 |
| Egg salad | 5 | 45 | 50 | 0.1 | |
| Panel B | |||||
| Fever | |||||
| Sandwich | |||||
| Chicken | 5 | 0 | 5 | 1.0 | 0.9 |
| Egg salad | 5 | 45 | 50 | 0.1 | |
| No fever | |||||
| Sandwich | |||||
| Chicken | 0 | 45 | 45 | 0.0 | NA |
| Egg salad | 0 | 0 | 0 | NA | |
