Table 1. Characteristics of the study... | American Society of Hematology

Table 1.

Characteristics of the study cohort: white and African American male veterans with at least one hospital admission between July 1, 1969, and September 30, 1996, who were followed more than 1 year

	Whites			African Americans
Characteristics	Other than ITP	ITP	Other than ITP	ITP
No. of subjects	3 882 044	5 939	873 265	1257
Mean age at study entry, y*	51.8	52.2	47.4	47.8
Years of follow-up (mean)†	11.6	5.5	11.9	6.0
Person-y at risk†	45 214 080	32 525	10 374 274	7484
Mean age at ascertainment of ITP, y	NA	58.7	NA	54.8

	Whites			African Americans
Characteristics	Other than ITP	ITP	Other than ITP	ITP
No. of subjects	3 882 044	5 939	873 265	1257
Mean age at study entry, y*	51.8	52.2	47.4	47.8
Years of follow-up (mean)†	11.6	5.5	11.9	6.0
Person-y at risk†	45 214 080	32 525	10 374 274	7484
Mean age at ascertainment of ITP, y	NA	58.7	NA	54.8

ITP indicates immune thrombocytopenic purpura (applied ICD-8 code: 287.1, ICD-9 code: 287.3); and NA, not applicable.

Age at first discharge record for inpatient hospitalization at Veterans Affairs hospitals between July 1, 1969, and September 30, 1996.

†

The first year of follow-up was censored.

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