Table 1.

Characteristics of living kidney donors between 1999–2004 and 2005–2010 in each income quintile

Characteristic	1999–2004	2005–2010	P Value
Q1 (n=11,100 living donors)			a
Mean age±SD (yr)	38±11	39±11	<0.001
Women (%)	58	58	0.75
Race (%)			<0.001
White	51	52
Black	26	22
Other	23	26
Donor relation (%)			<0.001
Related	76	64
Spousal	10	12
Unrelated	14	24
Q2 (n=12,655 living donors)
Mean age±SD (yr)	39±11	40±11	<0.001
Women (%)	59	60	0.10
Race (%)			<0.001
White	72	70
Black	15	14
Other	13	16
Donor relation (%)			<0.001
Related	72	59
Spousal	11	13
Unrelated	17	28
Q3 (n=14,390 living donors)
Mean age±SD (yr)	39±11	40±11	<0.001
Women (%)	59	60	0.02
Race (%)			<0.001
White	73	73
Black	13	12
Other	14	15
Donor relation (%)			<0.001
Related	70	60
Spousal	11	12
Unrelated	19	28
Q4 (n=16,353 living donors)
Mean age±SD (yr)	40±10	41±11	<0.001
Women (%)	59	61	0.08
Race (%)			<0.001
White	76	74
Black	11	11
Other	13	15
Donor relation (%)			<0.001
Related	69	58
Spousal	12	13
Unrelated	19	29
Q5 (n=17,384 living donors)
Mean age±SD (yr)	42±11	43±11	<0.001
Women (%)	58	61	<0.001
Race (%)			<0.001
White	79	77
Black	9	9
Other	12	14
Donor relation (%)			<0.001
Related	67	56
Spousal	14	15
Unrelated	19	29	b

^aWhere not stated, missing values comprised <5% of all values.

^bDonor income categories based on 2000 US Census data.