Table 1 Descriptive characteristics of mothers, infants and neighbourhoods according to adverse birth outcomes, singleton births, Montréal, 1997–2001
CharacteristicsPTB*TotalLBW†TotalSGA‡Total
%n%n%n
Mothers
Proximity to highway
    <200 m7.059275.359259.85923
    ⩾200 m6.393 2514.693 2559.193 164
Age (years)
    <208.639896.9399112.43982
    20–346.077 0954.477 0999.077 033
    ⩾357.118 0945.218 0908.918 072
Education
    Less than high school graduation8.115 8596.415 86211.815 843
    High school graduation7.310 9875.210 98810.210 982
    Some college or preuniversity6.721 6585.121 6649.721 635
    Some university or better5.450 6563.750 6487.950 609
Marital status
    Legally married5.759 7544.059 7508.659 716
    Other7.239 4245.539 43010.139 371
Country of birth
    Canada6.154 7134.454 7168.654 672
    Other6.644 4655.044 4649.844 415
History of prior stillbirth
    No6.296 3374.696 3389.296 251
    Yes9.228417.128429.52836
Infants
Birth order
    Firstborn6.947 0675.447 07111.247 012
    Other5.752 1113.952 1097.452 075
Sex
    Male6.751 0054.351 0069.350 954
    Female5.948 1735.048 1749.148 133
Year of birth
    19976.020 6074.920 6159.920 588
    19986.619 8745.019 8719.819 851
    19996.419 5354.519 5318.919 510
    20006.419 4514.519 4508.519 438
    20016.219 7114.219 7138.719 700
Neighbourhoods
% low-income families
    Q1 (poorest)7.122 9255.722 92810.922 906
    Q26.819 6784.819 6789.519 657
    Q36.618 8194.718 8249.018 800
    Q46.018 3814.218 3798.818 363
    Q5 (richest)4.919 3753.419 3717.319 361
Total6.399 1784.699 1809.299 087
  • *Preterm birth.

  • †Low birthweight.

  • ‡Small-for-gestational-age.