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Table 1 Characteristics of mothers, infants, and neighborhoods according to marital status, singleton births, Montréal, Canada, 1997 to 2001

From: The joint influence of marital status, interpregnancy interval, and neighborhood on small for gestational age birth: a retrospective cohort study

Characteristic Married Unmarried Total births
  n % n % n %
Mothers       
   Age       
<20 years 582 1.0 3388 8.6 3970 4.0
20–34 years 46606 78.8 29836 76.2 76442 77.7
35+ years 11962 20.2 5956 15.2 17918 18.2
   Education (years) 59150 14 (4)* 39180 13 (3)* 98330 14 (4)*
   Maternal place of birth       
Canadian-born 24963 42.2 29985 76.5 54948 55.9
Foreign-born 34187 57.8 9195 23.5 43382 44.1
Infants       
   IPI category       
   Firstborn 25564 43.2 22265 56.8 47829 48.6
   Subsequent born       
Short IPI 6045 10.2 3190 8.1 9235 9.4
Intermediate IPI 15760 26.6 6808 17.4 22568 23.0
Long IPI 11781 19.9 6917 17.7 18698 19.0
   Growth       
Normal growth 54087 91.4 35219 89.9 89306 90.8
SGA 5063 8.6 3961 10.1 9024 9.2
Neighborhoods       
   Perceived security       
High 13715 23.2 6071 15.5 19786 20.1
High-moderate 14074 23.8 6653 17.0 20727 21.1
Moderate 12813 21.7 9849 25.1 22662 23.1
Low-moderate 10265 17.4 7959 20.3 18224 18.5
Low 8283 14.0 8648 22.1 16931 17.2
   Proportion foreign-born       
High 16015 27.1 5135 13.1 21150 21.5
High-moderate 13935 23.6 4831 12.3 18766 19.1
Moderate 11495 19.4 8163 20.8 19658 20.0
Low-moderate 11083 18.7 8532 21.8 19615 20.0
Low 6622 11.2 12519 32.0 19141 19.5
   Total live births 59150 60.2 39180 39.8 98330 100
  1. * Values represent the mean (standard deviation).