Table 1.
Sensitivity and positive predictive value of diagnoses for confirming rheumatoid arthritis
| Diagnostic codes | DMARD dispensings | Using chart review as gold standard (N = 210) | ||||
|---|---|---|---|---|---|---|
| Stratified sample, no. | True-positives, no. | False-positives, no. | Sensitivity,a % | Positive predictive value,a % | ||
| ≥ 1 | 0 | 210 | 125 | 85 | 100b | 60 |
| ≥ 1 | ≥ 1 | 175 | 119 | 56 | > 99 | 74 |
| ≥ 2 | 0 | 140 | 108 | 32 | 97 | 77 |
| ≥ 2 | ≥ 1 | 105 | 91 | 14 | 81 | 87 |
a
The sensitivity, positive predictive value, is weighted to reflect the sampling fractions.
b
By definition.
DMARD = disease-modifying antirheumatic drug.