Table 1. Subject characteristics.

Characteristic	Irradiated Subjects	Unirradiated Subjects
	N = 9 No. (%)	N = 20
	No. (%)	No. (%)
Age (mean, range)	54 (35–73)	52 (26–71)
Sex
Male	4 (44%)	5 (25%)
Female	5 (56%)	15 (75%)
Race
Caucasian	7 (78%)	16 (80%)
African-American	1 (11%)	2 (10%)
Hispanic	1 (11%)	1 (5%)
Asian	0 (0%)	1 (5%)
Visual acuity class
Normal (20/12.5 – 20/25)	4 (44%)	16 (80%)
Near Normal (20/32 – 20/63)	5 (56%)	2 (10%)
Moderate or worse (<20/80)	0 (0%)	0 (0%)
Missing Data	0 (0%)	2 (10%)
Smoking history
Never	3 (33%)	15 (75%)
Light (<15 pack-years)	4 (44%)	2 (10%)
Heavy (>15 pack-years)	2 (22%)	2 (10%)
Missing Data	0 (0%)	1 (5%)
Vascular co-morbidities
Peripheral vascular disease	0 (0%)	0 (0%)
Hypertension	3 (33%)	3 (15%)
Stroke	0 (0%)	0 (0%)
Coronary artery disease	0 (0%)	0 (0%)
Hyperlipidemia	1 (11%)	4 (20%)
Missing Data	0 (0%)	1 (5%)