37 % of participants are White , 22 % are African - American , 10 % are Hispanic , 2 % are Asian , 4 % are Native American .
19 % are of unknown race or ethnicity .
37 % of participants are White , 22 % are African - American , 10 % are Hispanic , 2 % are Asian , 4 % are Native American , and 19 % are of unknown race or ethnicity .