Table 4.

Estimated effects of covariates on the likelihood of unintended versus intended birth: First births (Relative Risk Ratios with Standard Errors in parentheses)

	Model 1	Model 2	Model 3	Model 4
Variable	Reduced (not accounting for heterogeneity)	Full (not accounting for heterogeneity)	Reduced (accounting for heterogeneity)	Full (accounting for heterogeneity)
Age	2.09*** (.32)	2.05*** (.31)	2.48*** (.13)	2.76*** (.13)
Age-squared	.98*** (.003)	.98*** (.003)	.98*** (.003)	.98*** (.003)
Race (ref: White)
Black	1.33* (.15)	1.43** (.16)	1.32* (.10)	1.50** (.10)
Hispanic	1.07 (.15)	1.07 (.15)	1.10 (.10)	1.06 (.11)
Other race	1.27* (.20)	1.31 (.20)	1.42* (.13)	1.39* (.13)
Mother’s education (ref:missing/did not complete HS)
High school graduate	1.05 (.11)	1.06 (.11)	1.04 (.09)	1.04 (.09)
Some college	1.07 (.13)	1.09 (.13)	.97 (.11)	.97 (.11)
College graduate	.96 (.12)	1.00 (.13)	.89 (.11)	.87 (.11)
Family background (ref: Biological parents)
Step family	1.41** (.15)	1.41** (.15)	1.38** (.09)	1.40** (.09)
Any other family	1.26* (.12)	1.24* (.12)	1.20* (.09)	1.24* (.09)
Respondent’s education
High school graduate	.99 (.12)	1.02 (.12)	.99 (.11)	1.02 (.11)
Missing education response	1.05 (.16)	1.05 (.17)	1.08 (.12)	1.06 (.12)
Union status at birth (ref:not in a coresidential relationship)
Married	.21*** (.03)	.21*** (.03)	.26*** (.11)	.27*** (.11)
Cohabiting	.66** (.09)	.65** (.09)	.70** (.09)	.70** (.10)
Personality characteristics
Respondent aspires to attend college		.96 (.03)		.92* (.04)
Conscientious		.96* (.01)		0.98 (.01)
Religiosity
Very important		.78** (.06)		.81* (.12)
Missing religion response		.78* (.10)		.85 (.12)
Person-months	997839	997839	997839	997839
Number of women	8000	8000	8000	8000
Log likelihooda	−665,185	−665,125	−665,088	−664,993

^***p<0.001,

^**p<0.01,

^*p<.05

Note:

^aThe estimated log likelihood is for the full multi-equation model, i.e., including all estimates in Tables 4–6 as well as effects on the contrast of (intended & unintended) births versus no birth.