Table 1. Comparisons of NCDB and SEER DLBCL patients.

Patient Characteristics	NCDB 2001-2004 (n=38,002)	SEER 17 2001-2004 (n=19,172)
Median age years (IQR)	68 (54-78)	68 (53-78)
Age >60 years	25133 (66.14)	12431 (64.84)
Sex, female	18173 (47.82)	8999 (46.94)
Race/Ethnicity*
White	31671 (83.34)	14298 (74.58)
Hispanic	2056 (5.41)	2079 (10.84)
Black	3001 (7.9)	1302 (6.79)
Other	1274 (3.35)	1390 (7.25)
Unknown	0	103 (0.54)
Stage
I/II	17327 (45.59)	6924 (36.12)
III/IV	15670 (41.23)	6324 (32.99)
Unknown	5005 (13.17)	5924 (30.90)
Diagnosis Year
2001	8014 (21.09)	4622 (24.11)
2002	8889 (23.39)	4669 (24.35)
2003	10361 (27.26)	4873 (25.42)
2004	10738 (28.26)	5008 (26.12)
Primary Site
Lymph node	23174 (60.98)	11855 (61.83)
Extra-nodal	14828 (39.02)	7317 (38.17)
Region
Northeast	8703 (22.9)	1092 (5.70)
Midwest	9782 (25.74)	4519 (22.93)
South	13054 (34.35)	2799 (14.20)
West	6463 (17.01)	10762 (54.60)

Abbreviations: IQR, inter-quartile range