Table 1. Event counts and patient-years observed by diagnosis, country, and age group.

Country, age group	Asthma			Respiratory tract infections
	Events (n)	Patient-years observed (n)	Mean incidence per 1,000 patient-months	All RTI events (n)	URTI events (n)	LRTI events (n)	Patient-years observed (n)	Mean RTI incidence per 1,000 patient-months	Mean URTI incidence per 1,000 patient-months	Mean LRTI incidence per 1,000 patient-months
England
0–4 years	197,942	2,220,194	7.4	2,030,265	1,949,508	92,166	2,679,568	63.1	60.6	2.9
5–12 years	96,092	3,500,493	2.3	1,525,504	1,503,407	23,467	4,940,896	25.7	25.4	0.4
Total	294,034	5,720,687	4.3	3,555,769	3,452,915	115,633	7,620,464	38.9	37.8	1.3
Scotland
0–4 years	18,905	252,940	6.2	150,990	144,936	6,870	295,511	42.6	40.9	1.9
5–12 years	10,372	408,272	2.1	118,462	116,979	1,598	557,239	17.7	17.5	0.2
Total	29,277	661,212	3.7	269,452	261,915	8,468	852,750	26.3	25.6	0.8
Wales
0–4 years	19,067	206,206	7.7	200,546	191,956	9,697	250,071	66.8	64.0	3.2
5–12 years	9,344	334,719	2.3	165,071	162,645	2,559	473,702	29.0	28.6	0.5
Total	28,411	540,925	4.4	365,617	354,601	12,256	723,773	42.1	40.8	1.4
Northern Ireland
0–4 years	10,681	87,983	10.1	75,931	72,843	3,526	115,320	54.9	52.6	2.5
5–12 years	4,239	140,867	2.5	58,020	57,196	869	223,695	21.6	21.3	0.3
Total	14,920	228,850	5.4	133,951	130,039	4,395	339,015	33.0	32.0	1.1
All countries
0–4 years	246,595	2,770,073	7.4	2,457,732	2,359,243	112,259	3,340,470	61.3	58.9	2.8
5–12 years	120,047	4,394,408	2.3	1,867,057	1,840,227	28,493	6,195,533	25.1	24.8	0.4
Total	366,642	7,151,674	4.3	4,324,789	4,199,470	140,752	9,536,003	37.8	36.7	1.2

RTI = respiratory tract infection; URTI = upper respiratory tract infection; LRTI = lower respiratory tract infection.