Prevalence of preterm, low birthweight, and small for gestational age delivery after breast cancer diagnosis: a population-based study

Table 1 Characteristics of live births according to maternal breast cancer history at time of delivery, 1990–2009

	Breast cancer history (n = 512)		General population (n = 1,911,757)
	n	%	n	%
Preterm birth
Term (≥37 weeks gestation)	404	78.9	1,703,476	89.1
Preterm (<37 weeks gestation)	108	21.1	206,026	10.8
Missing	0	0.0	2255	0.1
Low birthweight
Healthy weight (≥2500 g)	436	85.2	1,743,325	91.2
Low birthweight (<2500 g)	76	14.8	168,432	8.8
Missing	0	0.0	0	0.0
Small for gestational age
Not small for gestational age	444	86.7	1,696,048	88.7
Small for gestational age	68	13.3	213,188	11.2
Missing	0	0.0	2521	0.1
Education
Less than high school (≤11 years)	19	3.7	266,180	13.9
High school diploma (12 years)	123	24.0	662,969	34.7
Some or graduated college (13–16 years)	282	55.1	814,843	42.6
Professional/graduate degree (≥17 years)	87	17.0	164,664	8.6
Missing	1	0.2	3101	0.2
Marital status
Married	404	78.9	1,320,768	69.1
Not married	108	21.1	590,559	30.9
Missing	0	0.0	430	0.02
Parity
Primiparous (1 birth)	153	29.9	787,261	41.2
Multiparous (≥2 births)	359	70.1	1,124,496	58.8
Missing	0	0.0	0	0.0
Race/ethnicity
White, non-Hispanic	324	63.3	1,382,978	72.3
Black, non-Hispanic	188	36.7	528,779	27.7
Missing	0	0.0	0	0.0
Smoking
Non-smoker	463	90.4	1,605,661	84.0
Smoker	46	9.0	296,037	15.5
Missing	3	0.6	10,059	0.5
Maternal age at infant delivery (in years)
Mean (standard deviation)	34.6 (4.7)		27.1 (5.7)
Range	20.0–48.0		18.0–50.0
Age at breast cancer diagnosis (in years)
Mean (standard deviation)	31.8 (4.7)
Range	18.7–44.3
Chemotherapy
Did not receive chemotherapy	259	50.6
Received chemotherapy	253	49.4
Missing	0	0.0
Length of time between diagnosis and infant delivery
<2 years	195	38.1
2–4.9 years	197	38.5
≥5 years	120	23.4
Missing	0	0.0

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