Table 1

Prevalence of subjects with chronic cough and phlegm and of those with and without coexisting asthma according to sex

Chronic cough and phlegmWithout coexisting asthmaWith coexisting asthma
Males11.8 (11.1–12.5)9.6 (9.0–10.2)2.0 (1.7–2.3)
Females12.0 (11.4–12.7)9.5 (8.9–10.1)2.3 (2.1–2.7)
  • All data are presented as % (95% confidence interval)

  • The prevalences were adjusted for age, cumulative response rate and type of contact (telephone versus mail)