Likelihood ratios for GABHS pharyngitis according to derivation v validation*
| Score | LR+ | Percentage of patients with GABHS pharyngitis (95% CI) |
|---|---|---|
| *Abbreviations defined in glossary. | ||
| Derivation (original scoring) | ||
| −10 to 0 | 0.16 | 5% (0 to 12) |
| 1 to 10 | 1.12 | 26% (13 to 41) |
| 11 to 20 | 1.25 | 28% (14 to 45) |
| 21 to 30 | 9.77 | 75% (48 to 93) |
| 31 to 40 | 9.74 | 75% (19 to 99) |
| Validation (simplified scoring) | ||
| −1 | 0.16 | 5% (0 to 12) |
| 0 | 0.62 | 16% (7 to 30) |
| 1 | 2.61 | 44% (28 to 62) |
| 2 | 4.25 | 57% (29 to 82) |
| 3 | 16.23 | 83% (36 to 100) |