An Epidemiological Investigation into Nocturnal Asthma

Abstract

The prevalence of nocturnal asthma and its relationship with clinical features of the disease were studied in 150 consecutive patients. Nearly three-fourths of patients had nocturnal symptoms of asthma, either currently or in the past. There was no relation between the tendency to develop nocturnal symptoms and age, sex, atopic status, or periodicity of the disease. However, those with more severe asthma had a greater tendency to develop nocturnal symptoms. Patients currently having nocturnal symptoms had a poorer lung function.