Fig. 3

a Cumulative proportions of proven FBA by number of risk factors (witnessed choking crisis, noisy breathing/stridor/dysphonia, new onset wheezing/ recurrent/ persistent wheeze, and/or decreased air entry). Normal = patients with none of the above risk factors, Group 1 = patients with 1 risk factor, Group 2 = patients with any of the 2 above risk factors, Group 3 = patients with any of the 3 above risk factors and Group 4 = patient with all of the above risk factors. b Incidence of FBA found on bronchoscopy. Group categorizations: Group 1, children with abnormal physical and radiologic findings (n = 110); group 2, children with abnormal physical and normal radiologic findings (n = 30); group 3, children with normal physical and abnormal radiologic findings (n = 25); group 4, children with normal physical and radiological findings (n = 67). The sum is not equal 300 as in 58 cases either CXR was not done or not documented and therefore all the percentages were calculates based on 242 cases