Table 2.

Characteristics of African-American and white living kidney donors in the United States by zip code quintile of median household income

Characteristic	Median Household Income Quintiles					P Value
	Q1 (<$30,962)	Q2 ($30,962–$37,314)	Q3 ($37,315–$44,723)	Q4 ($44,724–$56,580)	Q5 (>$56,580)
African-American donors
Donors (n)	2590	1790	1743	1741	1466
Age (yr)	36±10	36±11	36±11	37±10	37±11	<0.001
Age categories (yr)						<0.001
18–39	65	67	66	62	57
40–59	34	32	33	37	41
≥60	1	1	1	1	2
Female sex	55	55	57	60	56	0.01
Donor type						<0.001
Related	82	81	78	77	75
Spousal	7	8	10	11	11
Other unrelated	11	11	12	12	14
Recipient race						<0.001
White	2	2	3	3	4
Black	97	96	95	95	94
Other	1	2	2	2	2
Recipient income						<0.001
Q1 (<$30,962)	65	18	14	14	11
Q2 ($30,962–$37,314)	12	55	13	10	9
Q3 ($37,315–$44,723)	10	11	53	13	12
Q4 ($44,724–$56,580)	8	9	12	52	13
Q5 (>$56,580)	5	7	8	11	55
White donors
Donors (n)	5413	8418	9880	11,713	13,142
Age (yr)	40±11	41±11	41±11	42±11	43±11	<0.001
Age categories (yr)						<0.001
18–39	48	46	45	43	37
40–59	48	50	51	53	58
≥60	4	4	4	4	5
Female sex	58	60	60	59	59	0.01
Donor type						<0.001
Related	66	63	64	62	62
Spousal	12	12	11	13	15
Other unrelated	22	25	25	25	23
Recipient race						<0.001
White	94	95	96	95	94
Black	1	2	2	2	3
Other	5	3	2	3	3
Recipient income						<0.001
Q1 (<$30,962)	58	9	6	5	3
Q2 ($30,962–$37,314)	13	56	13	9	7
Q3 ($37,315–$44,723)	10	13	53	13	10
Q4 ($44,724–$56,580)	10	13	15	55	16
Q5 (>$56,580)	9	9	13	18	64

Data are presented as mean ± SD or percentages, unless otherwise stated. Where not stated, missing values comprised <5% of all values.