Asthma risk stratification based on percentile cut-off.
| Percentile | Sensitivity, % (n) | Specificity, % (n) | PPV, % (n) | NPV, % (n) | +LR# | −LR¶ |
| >50th | 78.4 (40/51) | 40.9 (9/22) | 75.5 (40/53) | 45.0 (9/20) | 1.3 | 0.5 |
| >75th | 72.5 (37/51) | 77.3 (17/22) | 88.1 (37/42) | 54.8 (17/31) | 3.2 | 0.4 |
| >90th | 58.8 (30/51) | 95.5 (21/22) | 96.8 (30/31) | 50.0 (21/42) | 13.1 | 0.4 |
| >98th | 33.3 (17/51) | 100 (22/22) | 100 (17/17) | 39.3 (22/56) | ∞ | 0.7 |
#: +LR: sensitivity/(1-specificity). ¶: −LR: (1-sensitivity)/specificity. LR: likelihood ratio; NPV: negative predictive value; PPV: positive predictive value.