Table 1.
Number of matched controls per case.
| Bullous pemphigoid | Pemphigus vulgaris | |
|---|---|---|
| Number of controls | Occurrences | Occurrences |
| 1 | 2 | 3 |
| 2 | 7 | 4 |
| 3 | 11 | 15 |
| 4 | 9 | 1 |
| 5 | 0 | 1 |
| 6 | 0 | 0 |
| 7 | 0 | 1 |
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