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Table 1 Descriptive characteristics of the RN offspring cohort, 1986-2000.

From: Cancer incidence and adverse pregnancy outcome in registered nurses potentially exposed to antineoplastic drugs

  N %
Total births 23,222  
   Singletons 22,613 97.4%
   Stillbirths1 147 0.6%
   Twins 581 2.5%
   Triplets 28 0.1%
Live singletons 22,491  
   Only child 9,163 40.7%
   2 children 8,454 37.6%
   ≥ 3 children 4,874 21.7%
   Males 10,961 48.7%
   Females 11,530 51.3%
RN mothers 12,741  
Mother's age at birth   
   < 30 years 7,943 35.3%
   30 - 34 years 9,371 41.7%
   ≥ 35 years 5,177 23.0%
  1. 1Value includes twins and triplets, and cases with missing or incomplete congenital anomaly diagnosis data.