TABLE 2.

Incidence rate and adjusted and unadjusted HRs for each group (Study 1).

Variable	Total	Cases	10,000 PY	Adjusted hazard ratio	Unadjusted hazard ratio
Total	263,874	6,907
Asthma
No	131,937	3,248	2.44	1	1
Yes	131,937	3,659	2.90	1.17 (1.11–1.23)	1.20 (1.14–1.25)
Sex
Female	121,436	1,637	1.35	1	1
Male	142,438	5,270	3.81	2.83 (2.68–2.99)	2.81 (2.66–2.97)
Age, years
11–17	51,445	901	1.79	1	1
6∼10	81,785	2,476	3.07	1.79 (1.66–1.94)	1.72 (1.59–1.86)
0–5	130,644	3,530	2.75	1.70 (1.58–1.84)	1.54 (1.43–1.66)
Economic status
20–80%	156,397	3,926	2.55	1	1
<20%	32,387	990	3.12	1.26 (1.17–1.35)	1.22 (1.14–1.31)
>80%	75,090	1,991	2.71	1.05 (0.99–1.10)	1.06 (1.01–1.12)
Region
Rural	81,772	1,807	2.24	1	1
Metro	182,102	5,100	2.86	1.31 (1.24–1.38)	1.27 (1.21–1.34)
Atopic dermatitis
No	210,842	5,360	2.59	1	1
Yes	53,032	1,547	2.94	1.09 (1.03–1.16)	1.13 (1.07–1.20)
Allergic rhinitis
No	252,718	6,564	2.65	1	1
Yes	11,156	343	3.12	1.15 (1.03–1.29)	1.18 (1.06–1.31)
CCI
0	162,665	4,165	2.61	1	1
1	96,498	2,559	2.69	1.06 (1.01–1.12)	1.03 (0.98–1.08)
2	4,711	183	4.00	1.49 (1.29–1.73)	1.53 (1.32–1.77)

10,000 PY, per 10,000 person-years and CCI, Charlson comorbidity index.