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Table 4 The effects of the combinations of exposure to maternal smoking during pregnancy and pre-pregnancy overweight on term birth weight and the risk of being SGA and LGA

From: The joint effect of maternal smoking during pregnancy and maternal pre-pregnancy overweight on infants’ term birth weight

Categories

Birth weight (g)

SGA

LGA

Crude Diff (g)

(95% CI)

Adjusted Diff a (g)

(95% CI)

Crude OR

(95% CI)

Adjusted OR b

(95% CI)

Crude OR

(95% CI)

Adjusted OR c

(95% CI)

SM -

OV-

0 (Ref)

0 (Ref)

1.0 (Ref)

1.0 (Ref)

1.0 (Ref)

1.0 (Ref)

SM+

OV-

−177.1 (−226.8, −127.4)

−163.8 (− 214.4, −113.1)

2.06 (1.49, 2.84)

1.94(1.39, 2.69)

0.73 (0.49, 1.07)

0.75 (0.51, 1.09)

SM -

OV+

110.4 (64.6, 156.2)

120.4 (74.1, 166.8)

0.57 (0.36, 0.90)

0.55 (0.34, 0.86)

1.79 (1.37, 2.33)

1.81 (1.38, 2.37)

SM+

OV+

−46.6(− 131.2, 38.1)

−26.6(−113.0, 59.8)

1.21 (0.64, 2.30)

1.06 (0.56, 2.04)

1.05 (0.59, 1.87)

1.09 (0.61, 1.96)

  1. Abbreviations: Diff mean Difference, SGA Small for gestational age, LGA Large for gestational age, OR Odds ratio, CI Confidence interval, SM maternal smoking during pregnancy, OV maternal pre-pregnancy overweight
  2. aMultivariable linear regression adjusted for maternal age and education
  3. bMultivariable logistic regression adjusted for maternal age and education
  4. cMultivariable logistic regression adjusted for maternal age and education