Table 1.
Patient characteristics across both clinics
| UK (n = 116) | US (n = 204) | P | |
|---|---|---|---|
| Age (years)* | 57 ± 11.3 | 64 ± 13.0 | <0.001 |
| Sex Female (%) | 84 (72) | 143(70) | 0.756 |
| Cough duration (months)** | 48 (24–120) | 30 (12–96) | <0.001 |
| Smoking history | 0.72 | ||
| Current | 2 (1.7) | 6 (3) | |
| Ex-smokers | 31 (26.7) | 75 (37) | |
| Never smokers | 81 (69.8) | 123 (60) | |
| Missing data | 2 | 0 | |
| FEV1 percent predicted* |
n = 76 91.3 ± 22 |
n = 179 86.3 ± 20.2 |
0.080 |
| FVC percent predicted* |
n = 69 100 ± 20.5 |
n = 179 92 ± 17.4 |
0.002 |
| Heartburn | 38 (32.8%) | 34 (16%) | 0.002 |
| Acid suppression response | 15 (12.9%) | 40 (20%) | 0.171 |
Statistically significant P values are given in bold
*Mean (SD)
**Median (IQR)