Table 2.

Descriptive characteristics of singleton stillbirths and live births from the Stillbirth Collaborative Research Network Study (2006-2008) using the weighted sample.

Characteristic	Stillbirths %w	Live births %w
	N=266	N=1135
	Nw=262	Nw=915
Adjusted birth weight percentilea
<5th percentile	33.9	9.0
5th-10th percentile	7.3	6.0
10th-25th percentile	11.6	15.0
25th-50th percentile	15.7	23.7
50th-75th percentile	8.2	21.2
75th-90th percentile	8.1	11.7
90th-95th percentile	4.6	5.6
95th-100th percentile	10.5	7.8
Gestational Age
<20 completed weeks	1.3	0.0
20-23 completed weeks	29.4	0.3
24-27 completed weeks	14.3	0.4
28-31 completed weeks	15.9	0.7
32-36 completed weeks	20.7	7.6
≥37 completed weeks	18.3	91.0
Maternal Age, years
<20	15.5	10.4
20 – 34	70.5	76.1
35 – 39	12.3	11.0
≥40	1.7	2.5
Maternal Race/Ethnicity
Non-Hispanic white	32.5	44.1
Non-Hispanic black	22.4	11.7
Hispanic	38.9	37.1
Other	6.1	7.1
Maternal Education
0 – 11 (none/primary/some secondary)	25.3	18.4
12 (completed secondary)	30.8	27.2
≥13 (college)	43.8	54.4
Marital Status
Not married or cohabitating	27.2	15.7
Cohabitating	27.3	23.1
Married	45.5	61.2
Maternal BMI
<18.5	2.6	2.8
18.5 – 24.9	39.7	50.9
25 – 29.9	25.7	22.3
30 – 34.9	18.0	12.7
≥35	14.0	11.2
Pre-gestational diabetes/gestational diabetes	9.0	10.1
Chronic hypertension/preeclampsia	12.0	9.2
Insurance
No insurance	7.1	4.3
Any public/private insurance	58.3	49.8
Veterans Affairs/commercial health ins/health maintenance organization	34.6	45.9
Maternal Smoking Statusb
Did not smoke	80.3	87.3
< 10	10.2	6.5
≥ 10	9.5	6.2
Alcohol Usec
Did not drink	59.6	58.8
Drank, no binging	18.6	23.3
Binged	21.8	17.8
Illicit Drug Used
Never used drugs	68.7	71.7
Ever used drugs w/o addiction	26.9	26.2
Ever used drugs w/ addiction	4.4	2.0

Abbreviations: BMI – body mass index; N_w – weighted sample size; %_w – weighted percent

^aBased on adapted individualized norms ^{14, 15}

^bAverage number of cigarettes during three months prior to pregnancy, self-reported

^cAlcohol consumption during three months prior to pregnancy, self-reported

^dLifetime drug use, self-reported