Table 1. Prevalence of asthma from 1998 to 2013: KNHANES database.

Characteristics	1998	2001	2005	2007	2008	2009	2010	2011	2012	2013
Prevalence* (%)	1.2	1.4	2.1	2.2	2.7	2.8	3.1	3.0	2.7	2.8
Sex
Male	1.0	1.3	2.0	1.8	2.2	2.5	3.1	2.6	2.6	2.3
Female	1.3	1.4	2.3	2.8	3.5	3.2	3.2	3.7	2.9	3.6
Age (yr)
19–29	0.4	0.4	1.1	0.7	2.3	2.9	3.2	3.8	2.4	3.8
30–39	0.4	0.4	0.7	0.5	1.5	2.3	3.1	1.8	2.4	1.4
40–49	0.6	0.7	1.2	2.0	1.7	1.7	1.5	1.6	2.5	1.3
50–59	1.4	1.6	2.6	3.5	2.8	2.3	2.9	2.6	2.4	2.0
60–69	3.4	3.4	4.8	4.9	4.3	4.6	3.8	5.5	3.1	5.2
≥ 70	4.3	6.2	8.3	7.0	8.9	5.5	6.7	6.6	5.5	7.7
Elderly (≥ 65)	4.2	5.5	7.1	7.1	7.4	5.2	5.6	6.4	4.4	7.0
Male	5.2	6.2	7.4	6.2	5.1	5.0	5.1	4.8	3.9	3.2
Female	3.5	5.0	6.9	7.7	8.9	5.3	6.0	7.5	4.8	9.7

KNHANES: Korea National Health and Nutrition Examination Survey.

^*Standardized for >19 years of age.