Table 2 Frequencies and crude odds for proximity to highway associated with maternal education and neighbourhood percentage low-income families, singleton births, Montréal, 1997–2001
Characteristics<200 m⩾200 m<200 m versus ⩾200 m
n (%)n (%)OR (95% CI)
Maternal education
    Less than high school graduation997 (6.3)14 870 (93.7)1.11 (1.03 to 1.20)
    High school graduation616 (5.6)10 373 (94.4)0.98 (0.90 to 1.08)
    Some college or pre-university1428 (6.6)20 243 (93.4)1.17 (1.10 to 1.25)
    Some university or better2883 (5.7)47 781 (94.3)1.00 (referent)
Neighbourhood % low-income families
    Q1 (poorest)2067 (9.0)20 866 (91.0)1.87 (1.73 to 2.02)
    Q21162 (5.9)18 526 (94.1)1.08 (0.90 to 1.18)
    Q3937 (5.0)17 889 (95.0)0.99 (0.90 to 1.08)
    Q4786 (4.3)17 600 (95.7)0.84 (0.77 to 0.93)
    Q5 (richest)975 (5.0)18 401 (95.0)1.00 (referent)