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Table 4 Smoking confounding effect on the estimates of birthweight and preterm birth in the 2007 dataset

From: Preterm birth and reduced birthweight in first and second teenage pregnancies: a register-based cohort study

  Primiparous Multiparous
  14-17 years 18-19 years 14-17 years 18-19 years
Outcomes Not adjusted for smokinga Adjusted for smokingb Not adjusted for smokinga Adjusted for smokingb Not adjusted for smokinga Adjusted for smokingb Not adjusted for smokinga Adjusted for smokingb
Birthweight estimates in grams -28(-59, 3) 4(-27, 35) -37(-58, -15) -11(-32, 11) -77(-137, -16) -72(-132, -13) -56(-83, -29) -34(-61, -6)
Preterm birth OR 1.09(0.59, 2.02) 1.08(0.58, 2.00) 1.08(0.79, 1.47) 1.03(0.76, 1.41) 1.85(1.34, 2.56) 1.76(1.27, 2.44) 1.36(1.07, 1.73) 1.29(1.01, 1.65)
  1. a adjusted for the same variables as in Tables 2 & 3.
  2. b adjusted as in a + maternal smoking