Table 3.

Logistic regression estimates of the effects of positive and negative pregnancy desires, individually and in combination, and two forms of their interaction on the hazard of pregnancy (N=887 women aged 18 or 19, 34,377 observations over 2.5 years in a county in Michigan, United States)

	Coefficients
Fi
Core measures
Desire to become pregnant	0 0.39***		0.22 *
	(0.06)		(0.10)
Desire to avoid pregnancy		−0.37 ***	−0.24 **
		(0.06)	(0.09)
Differences between core measures
Signed difference				.23 ***
				(.03)
absolute difference					−0.31***
					(0.06)
Summary statistics
Chi square	170.52	177.44	174.93	174.72	169.35
Log likelihood	−703.71	−703.23	−700.58	−700.59	−707.29
Model pseudo R2	0.141	0.141	0.144	0.144	0.136
Motivational pseudo R2	0 .028	0 .033	0 .035	0.035	0 .023

Note: Coefficients are effects on log odds. Standard errors are in parentheses. Model pseudo R² includes the effects of both control and motivational variables.

⁺p<.10,

^*p<.05,

^**p<.01,

^***p<.001 (two-tailed tests)

Source: As for Table 1