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. Author manuscript; available in PMC: 2014 Sep 9.
Published in final edited form as: Contemp Clin Trials. 2011 Oct 8;33(1):85–92. doi: 10.1016/j.cct.2011.09.016

Table 5a.

Model predicting case enrollment into the randomized trial.

Covariates Enrolled (versus not enrolled) N =642
Odds ratio 95% CI Overall p
Years Since Diagnosis 0.49
 Up to 3 years 0.78 (0.52, 1.17)
 4–5 years 0.95 (0.67, 1.35)
 6–8 years REF
Stage at diagnosis 0.66
 In-situ REF
 Localized 0.96 (0.57, 1.65)
 regional/distant 1.45 (0.67, 3.14)
 Unstaged 0.94 (0.33, 2.66)
Gender 0.14
 Male REF
 Female 1.26 (0.93, 1.72)
Age group at recruitment 0.44
 18–40 REF
 41–50 1.00 (0.59, 1.69)
 51–60 0.92 (0.55, 1.53)
 61–93 1.24 (0.75, 2.04)
Income <0.0001
 ≤$50K REF
 $51K– 70K 2.24 (1.42, 3.54)
 $71K– $99K 2.33 (1.39, 3.91)
 ≥$100K 1.39 (0.87, 2.21)
 don’t know/refused 0.60 (0.35, 1.03)
Education <0.0004
 ≤ high school degree REF
 some college/technical school 0.82 (0.51, 1.32)
 ≥ college degree 1.60 (1.01, 2.51)
Marital status 0.37
 not currently married REF
 Married 1.19 (0.82, 1.73)