Table 1.

Asthma prevalence stratified by age.

Age (yr)	Term			Preterm			Relative Risk
	Population	Asthma	Prevalence (%)	Population	Asthma	Prevalence (%)
0	7,264,218	503,212	6.93	99,139	8262	8.33	1.20 (1.18–1.23)***
1	7,264,218	1,623,888	22.35	99,139	26,706	26.94	1.21 (1.19–1.22)***
2	6,942,661	1,865,390	26.87	88,974	29,130	32.74	1.22 (1.20–1.23)***
3	6,583,351	1,731,872	26.31	78,573	23,889	30.40	1.16 (1.14–1.17)***
4	6,184,622	1,474,373	23.84	68,204	18,046	26.46	1.11 (1.09–1.13)***
5	5,772,663	1,103,919	19.12	57,981	12,261	21.15	1.11 (1.09–1.13)***
6	5,361,207	798,900	14.90	48,802	8241	16.89	1.13 (1.11–1.16)***
7	4,926,781	536,313	10.89	40,327	4963	12.31	1.13 (1.10–1.16)***
8	4,477,049	393,457	8.79	32,100	3234	10.07	1.15 (1.11–1.19)***
9	4,033,500	295,744	7.33	25,631	2115	8.25	1.13 (1.08–1.17)***
10	3,603,316	212,519	5.90	19,313	1300	6.73	1.14 (1.08–1.21)***
11	3,173,885	150,854	4.75	14,269	740	5.19	1.09 (1.01–1.17)*
12	2,720,664	98,489	3.62	10,150	420	4.14	1.14 (1.04–1.26)**
13	2,276,632	59,301	2.60	6685	217	3.25	1.25 (1.09–1.42)**
14	1,859,564	35,787	1.92	4455	117	2.63	1.36 (1.13–1.64)**
15	1,428,298	22,368	1.57	3183	64	2.01	1.29 (0.99–1.64)
16	969,159	15,240	1.57	2077	50	2.41	1.53 (1.14–2.02)**
17	500,546	7,074	1.41	930	9	0.97	0.68 (0.31–1.30)

*p < .05; **p < .01; ***p < .001.