Utility of the Leicester Cough Questionnaire(LCQ) predicting severe disease
| LCQ score | Sensitivity | Specificity | LR+ | LR- | Post-test OR | PPV | NPV |
| ≤10 | 29.4 | 98.5 | 19.6 | 0.7 | 14.5 | 93.7 | 65.4 |
| ≤11 | 39.2 | 95.6 | 8.9 | 0.6 | 6.6 | 87 | 68 |
| ≤12 | 47 | 94.2 | 8.1 | 0.5 | 6.0 | 85.7 | 71 |
| ≤13 | 52.9 | 86.9 | 4.0 | 0.5 | 3.0 | 75 | 71 |
| ≤14 | 64.7 | 84.0 | 4.0 | 0.4 | 3.0 | 75 | 76 |
| ≤15 | 74.5 | 79.7 | 3.7 | 0.3 | 2.7 | 73 | 81 |
Prevalence was 42.5% and pre-test odds ratio (OR) was 0.74. LR+: likelihood ratio for a positive test; LR-: likelihood ratio for a negative test; PPV: positive predictive value; NPV: negative predictive value.