Disorder | Subjects n | Adjusted# OR (95% CI) | p-value |
Current asthma | 102 | 3.04 (1.87–4.94) | <0.001 |
Upper airway cough syndrome | 157 | 1.32 (0.88–1.96) | 0.18 |
Gastro-oesophageal reflux disease | 113 | 1.24 (0.80–1.92) | 0.34 |
Unexplained chronic cough | 144 | 0.54 (0.36–0.81) | 0.003 |
Number of background disorders¶ | 271 | 1.62 (1.26–2.08) | <0.001 |
For each disorder, the control group was those with chronic cough but without that background disorder. Several subjects had more than one background disorder. #: adjusted for current smoking; ¶: the number of background disorders was calculated as the sum of current asthma, upper airway cough syndrome and gastro-oesophageal reflux disease; the odds ratio was calculated per one background disorder.