Table 4.

DBP trajectory models

	Intercept-only model		Linear model		Quadratic model		Cubic and individual main effectsc		Final model
Predictor	b	(SE)	b	(SE)	b	(SE)	b	(SE)	b	(SE)
Intercept	66.5a	0.26	63.4a	0.43	67.4	0.77	70.0a	1.50	66.3a	0.91
Level 1 (within person)
Gestational age (GA-linear)			0.11a	0.01	−0.23a	0.06	−0.54b	0.18	−0.36a	0.06
Gestational age (GA-quadratic)					0.006a	0.001	0.02b	0.0007	0.008a	0.001
Gestational age (GA-cubic)							−0.0001	0.0001
Weight change							0.006	0.006	0.12a	0.03
Level 2 (between person)
Race (1 = black; 0 = nonblack)							1.64b	0.51	2.68	0.62
BMI—underweight (1 = yes; 0 = no)							−2.17	1.11	−2.58b	1.07
BMI—overweight (1 = yes; 0 = no)							1.83b	0.65	1.57b	0.63
BMI—obese (1 = yes; 0 = no)							2.62a	0.61	2.51a	0.59
Cigarette smoking year prior to pregnancy							−1.41b	0.51	−1.43b	0.49
Cigarette smoking during first 24 wk of pregnancy							−0.56	0.59
Social conflict							−0.02	0.03
Perceived stress							−0.05	0.04
Prenatal distress							0.02	0.04
Marijuana use during first 24 wk of pregnancy							0.08	.094
Alcohol use during first 24 wk of pregnancy							0.37	0.95
Nutrition during pregnancy							−0.01	0.05
Exercise during pregnancy							0.05	0.12
Maternal age							0.20b	0.10
Median family income							0.000005	0.00002
High school dropout							−1.15b	0.57
Primigravida							−0.22	0.52
Workload							0.17	0.19
Interactions
GA-linear × weight change									−0.002b	0.0006
Weight change × race									−0.05b	0.02
Model fit
BIC	29,330.6		29,237.7		29,203.7				28,000.4

BMI, body mass index; GA, gestational age; BIC, Bayesian information criterion; DBP, diastolic blood pressure.

^ap < 0.0001.

^bp < 0.05.

^cEach main effect tested individually with the significant time effects.