Table 2. Characteristics of Patients with Myelodysplastic Syndrome by SEER Registration^*.

	SEER Registration
	Registered	Not Registered
Characteristics	(N=2,757)	(N=2,911)	P
Age (years) in January 2001
[median (interquartile range)]	79 (74-83)	78 (73-83)	0.005
Gender, %
Male	56.9%	48.3%	<0.001
Female	43.1%	51.7%
Race and Ethnicity,%
White	89.6%	88.5%	0.411
Black	5.2%	5.4%	0.799
Other	1.1%	1.2%	0.731
Asian	2.8%	3.0%	0.841
Hispanic	1.1%	1.7%	0.247
North American Native	<0.4%	<0.4%	0.855
Unknown	<0.4%	<0.4%	0.571
Registered with acute myeloid leukemia	<0.4%	7.6%	<0.001

NOTE: P values represent group comparisons on weighted t-tests. Percentages less than 0.4% are suppressed to protect patient anonymity.

^*MDS Patients identified using validated claims-based algorithms.