Table 6.

Cortical Opacity Incidence* and Surgery Rates by Ethnicity, Age, and Sex

	African-Americans						Caucasians
	Males			Females			Males			Females
Age Group, y	Eyes at Risk	Incidence % (n)	Surgery % (n)	Eyes at Risk	Incidence % (n)	Surgery % (n)	Eyes at Risk	Incidence % (n)	Surgery % (n)	Eyes at Risk	Incidence % (n)	Surgery % (n)
65–69	100	5.0 (5)	0.0 (0)	127	7.1 (9)	1.6 (2)	364	1.4 (5)	2.5 (9)	420	4.0 (17)	3.3 (14)
70–74	64	7.8 (5)	6.3 (4)	85	10.6 (9)	2.4 (2)	351	2.3 (8)	3.7 (13)	405	3.7 (15)	4.0 (16)
75–79	45	8.9 (4)	4.4 (2)	46	2.2 (1)	2.2 (1)	183	2.7 (5)	7.1 (13)	212	2.8 (6)	7.1 (15)
≥80	7	0.0 (0)	28.6 (2)	21	4.8 (1)	4.8 (1)	67	4.5 (3)	4.5 (3)	105	4.8 (5)	19.0 (20)
Total	216	6.5 (14)	3.7 (8)	279	7.2 (20)	2.2 (6)	965	2.2 (21)	3.9 (38)	1142	3.8 (43)	5.7 (65)
Overall by ethnicity	Eyes at risk 495		Incidence % (n) 6.9 (34)		Surgery % (n) 2.8 (14)		Eyes at risk 2107	Incidence % (n) 3.0 (64)		Surgery % (n) 4.9 (103)

^*Cortical incidence: An increase of at least 2/16 units from <2 at baseline to ≥2 at 2 years.