Table 1.

Distribution of cases and controls with respect to age.

Age group (yr)	Cases (% of total number)	Controls (% of total number)
	n = 200	n = 200
30–45	52 (26)	48 (24)
46–60	86 (43)	90 (45)
61–85	58 (29)	60 (30)
> 85	4 (2)	2 (1)