Table 1. Patients demographics.

		Maryland Site			Utah Site
Category	Sub-category	Patient Base n = 206,561	Study Sample n = 5,127	ARI Cases n = 142	Patient Base n = 47,257	Study Sample n = 10,250	ARI Cases n = 138
Age	<21 y	0.2	0	0	0.3	0	0
	21–30 y	2.3	1.7	3.5	4.5	1.1	3.6
	31–40 y	7.9	4.7	11.3	5.5	2.7	3.6
	41–50 y	15.9	14.9	28.2	9.1	7.5	13
	51–60 y	20.6	24.4	25.4	23.3	23.7	37
	61–70 y	13.6	16.5	14.1	18.8	21.5	18.1
	71–80 y	20.7	25.9	12.7	23.1	30.5	15.2
	81–90 y	15.2	11.4	4.9	14.9	12.7	8.7
	91–100 y	2.4	0.5	0	0.5	0.2	0.7
Sex	Male	86	91	88.7	92	96.1	92
	Female	14	9	11.3	8	3.9	8
Race	White	56.2	52.3	49.5	93.4	93.8	90.1
	African	42.8	46.4	50.5	1.6	1.1	0
	Hispanic	0.5	0.7	0	3.4	3.5	4.6
	Other	0.5	0.6	0	1.5	1.5	5.3

Numbers within column 3-8 represent the percentage of the base, study sample and ARI populations.