Table 2.

Apolipoprotein E genotype of all normal tension glaucoma (NTG) subjects, NTG subjects with progressive visual field loss, and controls

Genotype	All NTG		Progressive NTG		Controls
	No	Frequency	No	Frequency	No	Frequency
2\2	1	0.006	0	0.000	3	0.009
2\3	16	0.103	6	0.113	37	0.106
2\4	10	0.065	2	0.038	13	0.037
3\3	91	0.587	32	0.604	208	0.596
3\4	31	0.200	11	0.207	81	0.232
4\4	6	0.039	2	0.038	7	0.02
Total	155	1.000	53	1.000	349	1.000