Table 2.
Patient characteristics
| All patients (n = 320) | Responders (n = 55) | Non-responders (n = 265) | p | |
|---|---|---|---|---|
| Age (years)* | 61 ± 13 | 64 ± 14 | 61 ± 13 | 0.064 |
| Female, n (%) | 227(71) | 35 (64) | 192 (72) | 0.126 |
| FEV1 (percent predicted)* | 88 (21) | 86 (22) | 88 (21) | 0.494 |
| FVC (percent predicted)* | 94 (19) | 92 (19) | 95 (19) | 0.343 |
| Cough duration** (months) | 36 (18–117) | 36 (12–120) | 36(18–96) | 0.413 |
| Heartburn n (%) | 72 (23) | 20 (36%) | 52 (20%) | 0.007 |
| Smoking status | 0.293 | |||
| Never | 204 (63.7) | 38 (69.1) | 166 (62.9) | |
| Ex | 106 (33.1) | 15 (27.3) | 91 (34.3) | |
| Current | 8 (2.5) | 1 (1.8) | 7 (2.6) | |
| Missing data | 2 | 1 | 1 |
Statistically significant P values are given in bold
Values are expressed as the mean ± SD for normally distributed continuous variables*, the median (IQR) for non-normally distributed data**, and frequency (percentage) for discrete variables. Chi-squared test was performed for parametric data. Significance: P ≤ 0.05. Mann –Whitney U test for non-parametric data. Significance: P ≤ 0.05