Table 1.

Characteristics of first-time NMDP donors who donated a stem cell product between January 2004 and July 2009

Characteristic	N	%	N	%	P
No. of donors	272		6768
No. of donor centers	81		76
No. of collection centers	83		NA
No. of apheresis centers	NA		98
Donor sex					.168
Male	1638	60	4170	62
Female	1088	40	2598	38
Donor race/ethnicity					< .001
White	1935	71	5083	75
Hispanic	294	11	582	9
Black	165	6	320	5
Asian/Pacific Islander	144	5	294	4
American Indian/Alaska Native	42	2	77	1
Other/multiple race	130	5	351	5
Decline/unknown	16	1	61	1
Donor age at donation, y					.100
18-30	973	36	2380	35
31-40	878	32	2202	33
41-50	684	25	1616	24
51-61	191	7	570	8
Median, range	35	18-61	35	18-61	.377
Donor BMI, kg/m2					.646
Underweight (< 18.5)	14	1	41	1
Normal (18.5-24.9)	825	30	1970	29
Overweight (25-29.9)	1044	38	2659	39
Obese (≥ 30)	843	31	2097	31
Unknown	0		1	NA
Median, range	27.4	16.1-50.9	27.4	16.2-56.2	.899
Donor CMV					< .001
Nonreactive	1554	57	4124	61
Reactive	1172	43	2642	39
Unknown/indeterminate	0		2	NA
Donor WBC counts at baseline
Median, range	6.4	2.3-14.2	6.3	2.3-16.0	.544
Donor neutrophil counts at baseline
Median, range	4.0	1.0-12.5	4.0	1.0-12.9	.276
Donor MNC counts at baseline
Median, range	2.3	0.9-7.2	2.3	0.3-7.3	.633
Donor platelet counts at baseline
Median, range	254	104-534	254	100-548	.869
Donor hemoglobin level at baseline
Male, median, range	15.3	11.1-18.3	15.3	10.9-19.0	0.800
Female, median, range	13.5	8.6-19.0	13.4	9.4-16.5	.886
Year of donation					< .001
2004	491	18	814	12
2005	449	16	1102	16
2006	479	18	1188	18
2007	471	17	1297	19
2008	537	20	1497	22
2009	299	11	870	13

NMDP indicates National Marrow Donor Program; NA, not applicable; and WBC, white blood cell.