Table 1.

 Demographics and reproductive characteristics of the participants in the total sample grouped by mCB status

Demographics	Non-CB (n = 251)		mCB (n = 71)		F (df)	P value
	Mean	SD	Mean	SD
Maternal age, y	28.46	6.09	25.91	5.2	F(1,320) = 10.28	0.001
Paternal age, y	31.34	7.59	28.08	6.35	F(1,291) = 9.74	0.002
Parity	2.57	1.88	2.89	2.57	F(1,320) = 1.30	0.26
Birthweight, kg	3.25	0.55	3.16	0.65	F(1,266) = 1.21	0.27
Gestational age, wk	38.74	2.71	39.41	1.83	F(1,255) = 3.32	0.07
Placenta weight, g*	658.04	169.85	599.64	113.52	F(1,97) = 2.56	0.001
Prenatal trait anxiety	38.10	10.42	42.94	10.29	F(1,285) = 10.88	<0.001
Prenatal state anxiety	36.76	11.53	42.76	11.28	F(1,284) = 13.76	0.001
Depression	9.08	4.67	11.31	5.51	F(1,301) = 10.97	0.01

	N	% total	N	% total	Chi-square(df)	P value
Child sex (male)	137	54.6	33	46.5	X2(1) = 1.46	0.23
Marital status					X2(4) = 20.93	<0.001
Married	128	51	18	25.4
Common law	14	5.6	2	2.8
Single	106	42.3	49	69
Widowed	0	0	1	1.4
Divorced/separated	3	1.2	1	1.4
Education					X2(6) = 6.5	0.36
Primary school	6	2.4	3	4.2
Some high school	25	10	12	16.9
High school/GED	51	20.3	13	16.3
Some college	58	23.1	19	26.8
Associate degree	24	9.6	8	11.3
Bachelor’s degree	45	17.9	10	14.1
Graduate degree	42	16.7	6	8.5
Child race					X2(4) = 10.03	0.04
Asian	26	10.4	3	4.2
Black	48	19.1	18	25.4
Hispanic	114	45.4	34	47.9
White	54	21.5	9	12.7
Other	9	3.6	7	9.9
Prenatal alcohol use	15	6	7	9.9	X2(1) = 1.30	0.25
Prenatal cigarette smoke	14	5.6	19	26.8	X2(1) = 27.13	<0.001
Preeclampsia	15	6	8	11.3	X2(1) = 2.28	0.13
Gestational diabetes	17	6.8	4	5.6	X2(1) = 0.13	0.99†
Vaginal infection	13	5.2	3	4.2	X2(1) = 0.11	0.99†
C-section	59	23.5	23	32.4	X2(1) = 2.30	0.13

Bold indicates significance. DF, degrees of freedom; GED, General Educational Development test.

*Based on 96 available placenta weights (72 for non-CB and 24 for mCB).

^†Fisher’s exact test was used due to a small count (<5) in one of the cells.