Skip to main content

Table 3 Adjusted individual and DA-level fixed effects on continuous birth weight and their modification by maternal smoking (Model 3)

From: Air pollution, neighbourhood and maternal-level factors modify the effect of smoking on birth weight: a multilevel analysis in British Columbia, Canada

Variables Main effect
β (95 % CI)
Modification by cigs/day
β (95 % CI)
Corresponding figure
Cigarettes/daya -25.7 (-28.1 – -23.3) 0.83 (0.68 – 0.98) 1
SESi 43.8 (40.9 – 46.8) -2.7 (-3.7 – -1.6) 2A
Education 5.2 (2.3 – 8.1 1.3 (0.3 – 2.3) 2B
PM2.5 -26.3 (-29.6 – -23.0) 1.8 (0.9 – 2.7) 2C
 PM2.5 a 3.4 (1.5 – 5.3)
Immigrant density -36.5 (-39.2 – -33.7) 2.6 (1.5 – 3.7) 2D
Rural address -15.0 (-25.1 – -5.0) -2.9 (-5.6 – -0.2) 2E
Maternal age -12.1 (-14.8 – -9.5) -2.9 (-3.6 – -2.1) 3A
Drug/Alcohol flag -161.2 (-180.4 – -142.1) -3.7 (-6.3 – -1.2) 3B
  1. See Table 1 caption for variable definitions
  2. aModeled as a quadratic, value for Cigarettes/day listed under ‘Modification by cigs/day’; Model 3 covariates not listed above include: nulliparous and season of birth