The demographic characteristics of the sample are virtually equivalent to the U.S. census data for these tribes and have been presented previously for the linkage subsample (see Ehlers et al., 2004b). Two hundred forty seven men and three hundred and forty women participated in the study. Demographic characteristics of participants are shown in Table 1. Demographic comparisons of men and women (not shown in Table 1) showed no significant differences (p<0.05) for years of education, economic status, employment, marital status, and Native American heritage. There were no significant differences in the demographics between the linkage sample and the entire sample except that individuals in the linkage sample were more likely to have income lower than $20,000 a year (55% linkage sample, 47% entire sample; p<0.04).
