TABLE 4.

Hierarchical regression analysis for perceived lifetime stress severity predicting positive prenatal health behaviors (N = 164)

Variable	B	SE (B)	β	R2	ΔR2	p
Model 1				.06		.001
Lifetime stress exposure severity	−.1.21	.37	−.25			.001
Model 2				.17	.07*	.000
Lifetime stress exposure severity	−.03	.01	−.16			.03
Age	−.09	.12	−.07			.44
Household income	.48	.33	−.18			.15
Household education	.66	.47	−.16			.16
Ethnicity: African American	−.1.29	1.23	−.09			.29
Ethnicity: Other	.06	1.64	.00			.96
Model 3				.17	.08*	.000
Lifetime stress exposure severity	−.03	.01	−.16			.03
Age	−.08	.12	−.06			.48
Household income	.49	.34	.18			.15
Household education	.69	.49	.16			.15
Ethnicity: African American	−1.34	1.25	−.10			.28
Ethnicity: Other	.09	1.65	.00			.95
Marital status	−.30	1.20	−.02			.79
Model 4				.25	.20**	.000
Lifetime stress exposure severity	−.00	.01	−.03			.64
Age	−.19	.12	−.15			.10
Household income	.35	.32	.13			.27
Household education	.76	.47	.18			.10
Ethnicity: African American	−1.67	1.19	−.12			.16
Ethnicity: Other	−.16	1.58	−.00			.91
Marital status	−.09	1.15	−.00			.93
Current perceived stress	−.28	.07	−.32			.000

Abbreviation: SE, standard error.

^*p < .05.

^**p < .01.