Table 1.

Demographic Characteristics of American Indians Comparing the Full Sample (n = 587) to the Linkage Sample (n = 251)

Variable	Full sample (n = 587)	Linkage sample (n = 251)
Age (range, mean, SE)	18–76, 30.4 (0.5)	18–73, 30.2 (0.7)
Blood degree < 50%	61.3%	60.2%
Blood degree ≥ 50%	38.7%	39.8%
Gender	M = 247, F = 340	M = 110, F = 141
Education (years, mean, SE)	11.6 (0.1)	11.5 (0.1)
Income < $20,000/year	47.3%	55.4%
Income ≥ $20,000/year	52.7%	44.6%
Not married	82.4%	80.3%
Married	17.6%	19.7%