Table 1. Age, sex, and asthma prevalence of the study population (N = 398,235).

Characteristic	N	%
Age at the index date
<5 yrs	36,325	(9.1)
5–9 yrs	40,603	(10.2)
10–14 yrs	34,205	(8.6)
15–39 yrs	138,045	(34.7)
40–69 yrs	124,586	(31.3)
≥70 yrs	24,471	(6.1)
Sex (Female)	219,773	(55.2)
Asthma patients (Prevalence, %)
2002	290,343	(7.1)
2003	309,684	(7.5)
2004	325,554	(7.8)
2005	340,792	(8.1)
2006	351,233	(8.3)
2007	359,593	(8.3)