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Table 2 Adjusted fixed effects for level-1 and level-2 covariates on continuous term birth weight

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

Variables Model 1
β (95 % CI)
Model 2
β (95 % CI)
Maternal age -16.9 (-19.3 – -14.4) -14.9 (-17.4 – -12.4)
Nulliparous -107.7 (-112.5 – -103.0) -105.5 (-110.3 – -100.7)
Drug/Alcohol flag -171.6 (-186.9 – -156.3) -172.2 (-187.5 – -157.0)
Cigarettes/day -23.5 (-25.8 – -21.2) -26.2 (-28.5 – -23.9)
 cigarettes/daya 0.66 (0.51 – 0.80) 0.75 (0.61 – 0.90)
Fall/Winter season -9.6 (-14.1 – -5.0) -8.8 (-13.3 – -4.3)
SESi 42.7 (39.8 – 45.6)
Education 6.3 (3.5 – 9.1)
Immigrant density -35.8 (-38.5 – -33.2)
Rural address -18.8 (-28.4 – -9.2)
PM2.5 -25.0 (-28.2 – -21.8)
 PM2.5 a 3.3 (1.5 – 5.2)
  1. See Table 1 caption for variable definitions
  2. aModeled as a quadratic