Table 2.

Odds ratios of covariate risk factors predicting level of maternal smoking in B.C. 2001-2006 (n = 163,867)

Characteristic	OR (95% CI)	OR (95% CI)	OR (95% CI)
	Level 1 Vs.	Level 1+2	Level 1+2+3
	Level 2+3+4	Vs. Level 3+4	Vs. Level 4
Young Maternal Age (< 25)	3.66 (3.52-3.80)	3.27 (3.13-3.42)	2.86 (2.70-3.02)
Older Maternal Age (≥ 35)	0.67 (0.64-0.71)	0.71 (0.67-0.76)	0.77 (0.71-0.83)
Single Parent	2.42 (2.31-2.53)	2.25 (2.14-2.37)	2.27 (2.14-2.42)
Parity ≥ 1	1.26 (1.22-1.31)	1.49 (1.43-1.55)	1.59 (1.51-1.68)
Alcohol Indication	3.06 (2.63-3.57)	2.41 (2.08-2.81)	2.20 (1.88-2.59)
Drug Indication	10.19 (9.32-11.15)	8.17 (7.50-8.90)	7.65 (6.99-8.39)
Prenatal Care Visits (≤ 3)	1.39 (1.23-1.58)	1.39 (1.23-1.58)	1.39 (1.23-1.58)
Pre-existing Diabetes	1.27 (0.99-1.64)	1.27 (0.99-1.64)	1.27 (0.99-1.64)
Pre-pregnancy weight (≥ 75 kg)	1.48 (1.43-1.54)	1.49 (1.43-1.56)	1.56 (1.48-1.65)

Level 1 = never smoked, Level 2 = light smoker, Level 3 = moderate smoker, Level 4 = heavy smoker.