Patients presenting to Dr. Behcet Uz Child Disease and Surgery Education and Research Hospital with chronic cough between November 2006 and May 2007 were included in the study. Chronic cough was defined as cough lasting > 4 weeks. Initially, a detailed medical history of the patient was obtained and a physical examination was completed. The duration and characteristics of the cough, wheezing, allergy, sinusitis and respiratory tract infection, and the presence of smoking exposure, atopy, and asthma in the family were investigated. Symptoms of deformed chest, clubbing, and cardiac abnormality were examined. Patients with premature birth, known lung disease, neuromotor growth deficiency, cardiac disease, growth deficiency, and deformed chest, as well as those with an acute respiratory tract infection within the last 4 weeks were excluded from the study. Permission was obtained from the parents and the local ethics committee for participating of the children in the study.