croup cough prevalence at 12 months of age
Croup affects about 15% of children, and usually presents between the ages of 6 months and 5â6 years. It accounts for about 5% of hospital admissions in this population. In rare cases, it may occur in children as young as 3 months and as old as 15 years.t is a relatively common condition that affects about 15% of children at some point, most commonly between 6 months and 5â6 years of age. It is almost never seen in teenagers or adults. Before the advent of vaccination, croup was frequently caused by diphtheria, and was often fatal.