Table 1.

Baseline characteristics of study populations

Variable	Cases (N=417)		Controls (N=488)		p
	No.	%	No.	%
Sex					0.481
Male	281	67.4	318	65.2
Female	136	32.6	170	34.8
Age, y					0.756
<18	14	3.4	19	3.9
18-39	169	40.5	182	37.3
40-59	176	42.2	212	43.4
>60	58	13.9	75	15.4