Table 1.

Numbers of subjects enrolled in the study by sex and age class

	By sex		By region of origin1
Age class2	Males	Females	1	2	3	4	Total
<1 yr	179	159	168	45	30	95	338
1 year	17	12	14	7	6	2	29
2–10	28	35	21	13	11	18	63
11–20	28	61	54	10	14	11	89
21–29	79	340	155	92	44	128	419
30–45	134	405	169	116	67	187	539
>45	83	65	49	21	8	70	148
Totals	548	1077	630	304	180	511	1625

1. Region 1 = Arabian Peninsula, 2 = Africa, 3 = Eastern Mediterranean, 4 = Asia.

2. Age range in each of the age classes used for analysis