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. Author manuscript; available in PMC: 2010 Mar 1.
Published in final edited form as: Am J Obstet Gynecol. 2008 Nov 22;200(3):278.e1–278.e8. doi: 10.1016/j.ajog.2008.09.871

Table 3.

Study 3 (2002–2004) odds ratios (OR) and 95% Confidence Intervals (CI) from logistic regression predicting any drinking and binge drinking in the month prior to pregnancy 1

Any Drinking in Month Prior to Pregnancy Binge Drinking in Month Prior to Pregnancy
Factor N (%) OR (95% CI) N (%) OR (95% CI)
Age (yrs) (p < .001) (p < .001)
< 21 407 (34) 0.57 (.41, .79) 408 (18) 0.71 (.46, 1.09)
21–25 652 (47) 1.30 (1.02, 1.65) 648 (24) 1.63 (1.18, 2.26)
26–30 754 (39) 1.00 reference 740 (12) 1.00 reference
31–35 688 (49) 1.53 (1.22, 1.92) 680 (9) 0.82 (.57, 1.19)
36 + 348 (46) 1.31 (.99, 1.73) 343 (6) 0.50 (.29, .85)
Race (p < .001) (p = .021)
Native Am 119 (43) 1.01 (.67, 1.52) 119 (27) 1.89 (1.16, 3.08)
Asian 276 (26) 0.41 (.30, .55) 273 (9) 0.73 (.46, 1.17)
Black 329 (43) 1.27 (.97, 1.66) 326 (19) 1.52 (1.07, 2.17)
Hispanic 161 (34) 0.75 (.52, 1.08) 161 (14) 1.10 (.66, 1.82)
Other 56 (32) 0.56 (.30, 1.01) 54 (13) 1.07 (.45, 2.56)
White 1908 (47) 1.00 reference 1886 (14) 1.00 reference
Educ (yrs) (p < .001) (p = .125)
< 12 378 (37) 0.70 (.53, .93) 378 (20) 0.73 (.53, 1.03)
12–15 1576 (40) 1.00 reference 1560 (16) 1.00 reference
16 + 895 (52) 2.00 (1.61, 2.49) 881 (8) 1.18 (.82, 1.71)
Marital (p = .378) (p = .013)
Unmarried 1031 (44) 1.10 (.89, 1.36) 1024 (22) 1.43 (1.08, 1.89)
Married 1818 (43) 1.00 reference 1795 (10) 1.00 reference
Parity (p < .001) (p < .001)
1 1268 (50) 1.00 reference 1255 (18) 1.00 reference
2 907 (42) 0.67 (.55, .81) 897 (11) 0.51 (.39, .68)
3 403 (35) 0.48 (.37, .62) 399 (10) 0.39 (.26, .58)
4 + 271 (31) 0.33 (.24, .46) 268 (12) 0.41 (.26, .65)
Smoking (p < .001) (p < .001)
Nonsmoker 2119 (37) 1.00 reference 2093 (7) 1.00 reference
Smoker 730 (61) 4.34 (3.51, 5.35) 726 (34) 6.38 (4.90, 8.30)
1

In the analysis of any alcohol drinking in the month prior to pregnancy, the model with both age and education, and age and smoking interaction effects was nominally significant (p = .05) compared with the additive model. In the analyses of binge alcohol drinking in the month prior to pregnancy, the interaction effects were not statistically significant. Analyses with a “quasibinomial” model left results virtually unchanged. For simplicity we therefore report only the additive model.