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. Author manuscript; available in PMC: 2010 Apr 6.
Published in final edited form as: Addict Biol. 2009 Apr 28;14(3):338–348. doi: 10.1111/j.1369-1600.2009.00160.x

Table 2.

Means and counts of demographic variables in each cluster and comparison of variables in each pair.

Variable Cluster
1
Cluster
2
Cluster
3
1 vs 2
p-value
1 vs 3
p-value
2 vs 3
p-value

Mean; se Mean; se Mean; se

Age 26.8; 0.83 28.2; 1.16 38.3; 1.65 0.60 0.001 0.001

Number of years of
education
11.5; 0.13 11.0; 0.18 11.3; 0.42 0.10 0.84 0.80

N, % of total
population
N, % of total
population
N, % of total
population

Male 59, 23 42, 16 10, 04 0.03 0.002 0.229
Female 55, 16 28, 08 8, 02

N, % N, % N, %
Un-Employed 62, 56 41, 63 8, 44 0.428 0.447 0.182
Employed 49, 44 24, 37 10, 56

Income 0.641 0.804 1.000
< 20 K/year 53, 48 29, 44 8, 44
≥ 20 K/year 57, 52 37, 56 10, 56

Native American
Ancestry
0.446 0.316 0.792
< 50 66, 58 36, 51 8, 44
≥ 50 48, 42 34, 49 10, 56

Not
married
98, 86 60, 87 12, 67 1.000 0.080 0.074
Married 16, 14 9, 13 6, 33