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Table 3 Association between smoking before pregnancy (yes/no) and neonatal outcome

From: Pregnancy planning, smoking behaviour during pregnancy, and neonatal outcome: UK millennium cohort study

 

Neonatal outcome in mothers

Neonatal outcome in

   
 

who did not smoke before

mothers who smoked*

Crude1

Adjusted 1 **

Adjusted 2***

 

or during their pregnancy

before pregnancy

   

n/N (%)

n/N (%)

OR

(95% CI)

OR

(95% CI)

OR

(95% CI)

Low birth weight (<2.5 kg)

569/11,429 (5.00)

501/6,017 (8.33)

1.73

(1.42-2.05)

1.98

(1.62-2.41)

1.91

(1.56-2.34)

Prematurity (< 37 weeks gestation)

748/11,352 (6.59)

485/5,966 (8.13)

1.25

(1.09-1.45)

1.14

(0.96-1.35)

1.12

(0.95-1.35)

  1. 1The baseline group was women who did not smoke during pregnancy.
  2. *Including women who reduced or quit smoking at some time during pregnancy.
  3. **All adjusted for mother’s age and mothers education. Birth weight is also adjusted for ethnicity, religion and BMI. Prematurity also adjusted for relationship status.
  4. ***Adjusted for the same variables as model 1 plus planning.