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. Author manuscript; available in PMC: 2018 Sep 1.
Published in final edited form as: Addict Behav. 2017 Mar 8;72:8–13. doi: 10.1016/j.addbeh.2017.03.002

Table 4.

Effect of affected mother vs. father; effect of multiple affected parents; and effects of covariates.

Predictor/Covariate Unadjusted Model OR (95% CI) Adjusted Model OR (95% CI)
EB in mother but not father 2.67 (2.36, 2.99) 2.49 (2.21, 2.80)
EB in father but not mother 2.70 (2.52, 2.88)1 2.51 (2.34, 2.68)2
EB in mother x EB in father (interaction term) 0.60 (0.49, 0.72) 0.60 (0.50, 0.72)
Males vs. females 1.97 (1.81, 2.14)
Cohort 1975–1979 vs. 1970–1974, females 0.97 (0.87, 1.07)
Cohort 1980–1984 vs. 1970–1974, females 1.21 (1.10, 1.34)
Cohort 1975–1979 vs. 1970–1974, males 0.72 (0.67, 0.78)
Cohort 1980–1984 vs. 1970–1974, males 0.72 (0.66, 0.78)
Parental education (high vs. low) 0.63 (0.58, 0.68)
Parental education (mid vs. low) 0.94 (0.87, 1.01)
1

In the unadjusted model, the OR for having both parents affected is 4.30.

2

In the adjusted model, the OR for having both parents affected is 3.77.