Table 1.

Demographic characteristics by race.

Characteristic	Caucasian n = 3,742	African-American n = 2,779	Total n = 6,521
Female (%) Age (years)*	87.9	87.8	87.8
0-34 (%)	14.2	24.6	18.6
35-49 (%)	25.8	38.1	31.0
50-64 (%)	29.4	24.6	27.4
65+ (%)	30.6	12.7	23.0
Education (%)†*	56.5	55.1	55.9
Annual household income‡* (median, interquartile range)	$36,394 ($31,819 to $42,966)	$32,030 ($27,356 to $37,436)	$34,860 ($29,913 to $40,590)
Insurance*
Private (%)	40.0	31.9	36.5
Public (%)	55.0	61.0	58.0
Other (%)	5.0	7.1	5.5

^†Patients' level of education was defined by the percent with at least a high school education among adults over 25 years old in their zip code of residence (2000 U.S. Census).

^‡Patients' household income was defined by the median household income in their zip code of residence (2000 U.S. Census).

^*p < 0.0001 comparing Caucasians to African-Americans by t-tests, chi-square tests, or Wilcoxon rank sum tests, as appropriate.