Number of codes | PPV (%) | Sensitivity (%) | Specificity (%) | F1 score (%) | LR | |
LN codes without separation | 1 | 99 | 79 | 99 | 88 | 79 |
2 | 100 | 58 | 100 | 74 | ∞ | |
3 | 100 | 49 | 100 | 66 | ∞ | |
4 | 100 | 37 | 100 | 54 | ∞ | |
LN codes separated by 30 days | 1 | 99 | 79 | 100 | 88 | ∞ |
2 | 100 | 49 | 100 | 73 | ∞ | |
3 | 100 | 37 | 100 | 66 | ∞ | |
4 | 100 | 0 | 100 | 54 | ∞ | |
SLE and proteinuria/nephritis codes | 1 | 93 | 16 | 99 | 27 | 12 |
2 | No patients had two codes. | |||||
3 | 100 | 0 | 100 | ∞ | ||
SLE and proteinuria/nephritis codes separated by 30 days | 1 | 15 | 99 | 27 | 11 | |
2 | 100 | 9 | 100 | 25 | ∞ | |
3 | 100 | 4 | 100 | 16 | ∞ | |
4 | 100 | 0 | 100 | 9 | ∞ |
∞, Infinity; F1 score, harmonic mean of precision and recall scores; ICD-10, International Classification of Diseases, 10th Revision; LN, lupus nephritis; LR, likelihood ratio; PPV, positive predictive value.