Table 1: Principal causes of chronic cough in children.

PBB Asthma UACS GER Bronchiectasis Tracheo-malacia Habitual-psychogenic cough Spontaneous resolution Other
Marchant 2006 [19] (2.6 yrs average age) 40% 4% 3% 3% 6% - 1% 22% 21%
Asilsoy
2008 [20] (8.4 yrs average age)
23% 25% 20% 5% 3% - 4% 6% 3%
Khoshoo 2009 [22]
(7.8 yrs average age)
- 13% 23% 28% - - 10% - 25%
Chang
2012 [23] (4.5 yrs average age)
41% 15.8% 1.4% 2.3% 9% 6.1% 4.3% 13.9% 6.1%

Abbreviations: PBB: protracted bacterial bronchitis; GER: gastroesophageal reflux; UACS: upper airway cough syndrome