Table 3. Clinical features of different causes of chronic cough.
| Feature | CVA | CVA + UACS | UACS | P value |
|---|---|---|---|---|
| Cases | 17 | 37 | 37 | – |
| Female (%) | 52.9 | 43.2 | 51.3 | 0.53 |
| Age (years) | 8±2 | 8±2 | 9±3 | 0.09 |
| Duration (months) | 20.1±22.2 | 18.6±18.2 | 7.9±9.8 | <0.01 |
| Cough features, n (%) | ||||
| Non-productive cough | 14 (82.4) | 24 (64.9) | 17 (45.9) | 0.07 |
| Productive cough | 3 (17.6) | 16 (43.2) | 20 (54.1) | 0.08 |
| Nocturnal cough | 11 (64.7) | 27 (73.0) | 4 (10.8) | <0.01 |
| Cough in the morning | 4 (23.5) | 26 (70.3) | 26 (70.3) | <0.01 |
| Cough before sleep | 2 (11.8) | 16 (43.2) | 18 (48.6) | 0.04 |
| No difference in cough time frame | 2 (11.8) | 4 (10.8) | 3 (8.1) | <0.01 |
| Sports-related | 16 (94.1) | 31 (83.8) | 23 (62.2) | 0.02 |
| Infection-related | 2 (11.8) | 11 (29.7) | 7 (18.9) | <0.01 |
| Cold air-related | 8 (47.1) | 14 (37.8) | 8 (21.6) | 0.26 |
| Season-related | 6 (35.3) | 18 (48.6) | 14 (37.8) | 0.55 |
| Pharyngeal positive signa, n (%) | 1 (5.9) | 15 (40.5) | 18 (48.6) | 0.02 |
| Passive smoke, n (%) | 12 (70.6) | 13 (35.1) | 16 (43.2) | 0.10 |
| Atopy, n (%) | 11 (64.7) | 21 (56.8) | 14 (37.8) | 0.12 |
a, pharyngeal positive sign means presence of secretions in posterior pharyngeal wall or cobble stone appearance of the pharyngeal wall mucosa. UACS, upper airway cough syndrome; CVA, cough-variant asthma.