Frequency of selected variables in cases and controls
| Characteristic | Cases(n = 247)* | Controls(n = 1235)* | Likelihood ratio | 95% CI |
|---|---|---|---|---|
| *Values shown as number (%). | ||||
| Symptoms | ||||
| Haemoptysis | 50 (20) | 19 (1.5) | 13 | 7.9 to 22 |
| Loss of weight | 67 (27) | 54 (4.4) | 6.2 | 4.5 to 8.6 |
| Loss of appetite | 47 (19) | 49 (4.0) | 4.8 | 3.3 to 7.0 |
| Dyspnoea | 139 (56) | 192 (16) | 3.6 | 3.1 to 4.3 |
| Chest or rib pain | 100 (42) | 150 (9.2) | 3.3 | 2.7 to 4.1 |
| Fatigue | 87 (35) | 186 (15) | 2.3 | 1.9 to 2.9 |
| Consulting with cough | ||||
| First attendance | 160 (65) | 364 (29) | 2.2 | 1.9 to 2.5 |
| Second attendance | 106 (43) | 166 (13) | 3.2 | 2.6 to 3.9 |
| Third attendance | 69 (28) | 82 (6.6) | 4.2 | 3.2 to 5.6 |
| Signs | ||||
| Finger clubbing | 11 (4.5) | 1 (0.08) | 55 | 7.1 to 420 |
| Investigations | ||||
| Thrombocytosis | 34 (14) | 19 (1.5) | 8.9 | 5.2 to 15 |
| Abnormal spirometry | 24 (9.7) | 14 (1.1) | 8.6 | 4.5 to 16 |