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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).