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Sensitivity and positive predictive value of different cut points based on the number of International Classification of Diseases (ICD) codes for hidradenitis suppurativa (HS)
| ICD count | 0 | 1 | 2 | ≥ 3 |
|---|---|---|---|---|
| Case | 482 | 271 | 189 | 113 |
| Not case | 295 | 21 | 5 | 0 |
| Positive predictive value | 0·979 | 0·989 | 0·997 | |
| Sensitivity | 0·634 | 0·428 | 0·284 |
