Table 1.

Demographic comparison of incident hepatitis B virus cases and controls stratified by gender.

Total	Females				Males				Totals
	Cases	%	Control	%	Cases	%	Control	%	Cases	%	Control	%
	56	(100.0)	439	(100.0)	37	(100.0)	438	(100.0)	93	(100.0)	877	(100.0)
Age
<21	10	(17.9)	60	(13.7)	1	(2.7)	36	(8.2)	11	(11.8)	96	(10.9)
21–30	31	(55.4)	248	(56.5)	22	(59.5)	236	(53.9)	53	(57.0)	484	(55.2)
31–40	12	(21.4)	89	(20.3)	10	(27.0)	99	(22.6)	22	(23.7)	188	(21.4)
41+	3	(5.4)	41	(9.3)	4	(10.8)	66	(15.1)	7	(7.5)	107	(12.2)
Missing	0	(0.0)	1	(0.2)	0	(0.0)	1	(0.2)	0	(0.0)	2	(0.2)
Race
White	3	(5.4)	17	(3.9)	2	(5.4)	18	(4.1)	5	(5.4)	35	(4.0)
Black	50	(89.3)	400	(91.1)	32	(86.5)	403	(92.0)	82	(88.2)	803	(91.6)
Asian/Indian	0	(0.0)	3	(0.7)	1	(2.7)	4	(0.9)	1	(1.1)	7	(0.8)
Colored	3	(5.4)	19	(4.3)	2	(5.4)	13	(3.0)	5	(5.4)	32	(3.6)
Donor Type
New	15	(26.8)	85	(19.4)	6	(16.2)	35	(8.0)	21	(22.6)	120	(13.7)
Lapsed	6	(10.7)	101	(23.0)	3	(8.1)	43	(9.8)	9	(9.7)	144	(16.4)
Repeat	35	(62.5)	253	(57.6)	28	(75.7)	359	(82.0)	63	(67.7)	612	(69.8)
Unknown	0	(0.0)	0	(0.0)	0	(0.0)	1	(0.2)	0	(0.0)	1	(0.1)
Zone
Egoli/Vaal	21	(37.5)	128	(29.2)	13	(35.1)	124	(28.3)	34	(36.6)	252	(28.7)
Northern	9	(16.1)	57	(13.0)	3	(8.1)	64	(14.6)	12	(12.9)	121	(13.8)
KwaZulu Natal	8	(14.3)	104	(23.7)	12	(32.4)	113	(25.8)	20	(21.5)	217	(24.7)
Mpumalanga	6	(10.7)	75	(17.1)	4	(10.8)	89	(20.3)	10	(10.8)	164	(18.7)
Eastern Cape	12	(21.4)	75	(17.1)	5	(13.5)	48	(11.0)	17	(18.3)	123	(14.0)