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Table 1 Maternal characteristic among the four paternal categories: United States, 1995–2001

From: Uteroplacental bleeding disorders during pregnancy: do missing paternal characteristics influence risk?

  Completeness of paternal characteristics
Maternal Characteristics Complete (%) n = 22,221,335 Age missing (%) n = 212,474 Race missing (%) n = 311,938 Both missing (%) n = 3,590,802
Age (years)
   <20 9.3 23.8 17.9 31.6
   20–24 23.2 31.0 28.9 35.3
   25–29 28.8 21.5 23.7 17.7
   30–34 25.0 14.4 18.1 9.5
   ≥35 13.7 9.2 11.4 5.9
Education
   <12 18.3 47.0 31.7 44.1
   12 31.9 34.2 36.3 38.4
   13–15 23.4 13.6 18.7 14.3
   ≥16 26.5 5.2 13.3 3.2
Race
   White 83.9 70.3 77.8 54.0
   Black 11.0 25.0 17.1 42.2
   Others 5.1 4.8 5.2 3.8
Prenatal care began
   1st trimester 84.0 63.0 71.6 61.7
   2nd trimester 11.2 22.6 16.1 24.1
   3rd trimester 2.1 6.2 3.6 6.4
   No care 0.7 3.3 1.4 3.8
   Missing 2.0 4.9 7.3 4.0
Primiparity 32.3 36.7 37.9 40.7
Unmarried status 22.1 73.1 55.5 96.5
Smoking
   Yes 9.2 16.3 14.2 19.8
   No 72.6 48.9 70.5 71.3
   Missing 18.2 34.8 15.2 8.9
  1. All comparisons were statistically significant (P < 0.001)