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. Author manuscript; available in PMC: 2012 May 5.
Published in final edited form as: J Sleep Res. 2009 Aug 31;19(1 Pt 1):80–86. doi: 10.1111/j.1365-2869.2009.00756.x

Table 1.

Sociodemographic characteristics

Odds ratio
Characteristics % of cases (n = 45) % of controls (n = 95) Estimate 95% CI P for trend
Age group (years) 0.14
 18–25 28.9 18.0 1.0 Reference
 26–30 17.8 18.2 0.6 0.2–1.9
 31–35 20.0 17.7 0.6 0.2–1.9
 36–40   6.7 15.8 0.2 0.0–0.8
 41–45 11.1 17.2 0.3 0.1–1.2
 46–50 15.6 13.0 0.7 0.2–2.2
Gender
 Male 26.7 41.9 1.0 Reference
 Female 73.3 58.1 1.6 0.7–3.7
Race
 White 80.0 92.1 1.0 Reference
 African-American 13.3   1.4 8.1 1.9–34.3
 Asian American   2.2   0.9 2.0 0.2–23.0
 Hispanic   2.2   0.5 4.1 0.2–66.8
 Other   2.2   5.1 0.4 0.0–4.4
Education 0.068
 High school or less 33.3 24.3 1.0 Reference
 College 55.6 54.8 0.7 0.3–1.5
 Graduate school 11.1 20.9 0.3 0.1–1.1
Annual income (imputed) <0.001
 Under $20K 40.9 18.2 1.0 Reference
 $20K–40K 24.9 23.3 0.4 0.1–1.1
 $40K–60K 18.7 11.7 0.5 0.2–1.7
 $60K + 15.6 46.8 0.1 0.0–0.3

CI: confidence interval.