Incidence of Second Primary Malignancies in Patients with Castration-Resistant Prostate Cancer: An Observational Retrospective Cohort Study in the United States

Table 2

Demographic characteristics of study cohort (N = 2,234).

Variable	No. of patients ()
Age at cohort entry, years
Mean (SD)	76.6 (6.2)
Age group
65-69	297 (13.3)
70-74	625 (28.0)
75-79	595 (26.6)
80-84	451 (20.2)
85+	266 (11.9)
Race
White	1,867 (83.6)
Black	218 (9.8)
Asian	46 (2.1)
Hispanic	48 (2.1)
Other or unknown^†	55 (2.5)

SD, standard deviation.
^† Categories were combined to avoid reporting a count of < 11.