Differences of baseline characteristics between subjects who presented cough and those who did not develop cough at the 12-month follow-up
| Characteristic at baseline | Subjects with cough at follow-up (n=165) | Subjects without cough at follow-up (n=40) | p-value |
| Somatic symptom sum | 3.89 (3.50–4.28) | 2.38 (1.77–2.98) | <0.001 |
| Duration of the cough episode median (range) | 12–60 months (2 months to >10 years) | 2–12 months (2 months to >10 years) | 0.001 |
| Trigger sum | 5.60 (5.14–6.07) | 4.05 (2.98–5.12) | 0.003 |
| Presence of a chemical trigger | 84.8% | 65.0% | 0.004 |
| Gastroesophageal reflux disease | 22.4% | 7.5% | 0.033 |
| Current daily smoking | 10.3% | 0% | 0.034 |
| Family members | 1.58 (1.40–1.76) | 2.00 (1.59–2.41) | 0.051 |
| Wheezing | 52.1% | 37.5% | 0.097 |
Data are presented as mean (95% CI), unless otherwise stated. Characteristics with at least a suggestive association (p<0.10) are presented and based on chi-squared and Mann–Whitney U-tests.