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Internal validation of the high-performing EHR algorithms.
| Algorithm | PPV excluding DM, SSc£ in training set | PPV excluding DM, SSc£ in validation set |
|---|---|---|
| ≥ 3 SLE ICD-9 code* counts and ANA positive (≥ 1:40) and ever DMARD use and ever steroid use | 95% | 91% |
| ≥ 4 SLE ICD-9 code counts and ANA positive (≥ 1:160) | 89% | 94% |
| ≥ 3 SLE ICD-9 code counts and ever antimalarial use | 91% | 88% |
SLE ICD-9 code 710.0
Dermatomyositis (DM) ICD-9 code 710.3, Systemic Sclerosis (SSc) ICD-9 code 710.1
