| Frequency of meat intake | Number of subjects | |||
| Never-smokers | Ever-smokers | |||
| Case | Control | Case | Control | |
| Low frequency |
|
|
|
|
| ≤2 serving per week | 34 | 49 | 108 | 48 |
| Medium/high frequency |
|
|
|
|
| 1 serving per 2 days | 37 | 30 | 80 | 25 |
| ≥1 serving per day | 12 | 4 | 28 | 14 |