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Table 7 Frequency of Causes of Chronic Cough*
Cause of Cough
Percent of Cases
Post-nasal drip
41
Asthma
24
Gastroesophageal reflux disease
21
Chronic bronchitis
3
Bronchiectasis
4
Miscellaneous
4
*102 Patients studied by Irwin RS, et al. Am Rev Respir Dis 1990;141:640-647.