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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