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

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

  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