Table 2 Associations between SES and birth outcomes. Brussels vs Montreal

LBW

BRUSSELS (N=97 844)

MONTREAL (N=214 589)

%

ORs (95% CI)

adjusted ORs*

%

ORs (95% CI)

adjusted ORs*

Maternal education

High

4.08

1

1

3.66

1

1

Intermediate

4.81

1.18 (1.10-1.29)^a

1.16 (1.05-1.26) ^b

4.50

1.24 (1.17-1.30)^a

1.26 (1.19-1.33)^a

Low

4.80

1.19 (1.09-1.28)^a

1.20 (1.09-1.32)^a

5.86

1.64 (1.56-1.72)^a

1.67 (1.58-1.77)^a

Income Quintile

Top

3.72

1

1

3.63

1

1

Fourth

4.59

1.24 (1.09-1.42)^b

1.18 (1.03-1.35)^c

4.25

1.18 (1.10-1.26)^a

1.08 (1.01-1.16)^c

Middle

4.83

1.31 (1.16-1.49)^a

1.21 (1.05-1.38)^b

4.58

1.27 (1.19-1.36)^a

1.15 (1.07-1.23)^a

Second

4.49

1.22 (1.07-1.37)^b

1.15 (1.01-1.32)^c

4.69

1.31 (1.22-1.40)^a

1.14 (1.05-1.21)^a

Bottom

4.66

1.26 (1.13-1.41)^a

1.12 (0.98-1.27)

5.35

1.50 (1.40-1.60)^a

1.29 (1.20-1.38)^a

PRETERM

BRUSSELS (N=95 490)

MONTREAL (N=214 587)

%

ORs (95% CI)

adjusted ORs*

%

ORs (95% CI)

adjusted ORs*

Maternal education

High

4.68

1

1

4.77

1

1

Intermediate

5.38

1.16 (1.07-1.25)^a

1.12 (1.03-1.22)^b

5.95

1.26 (1.21-1.32)^a

1.28 (1.22-1.34)^a

Low

5.40

1.16 (1.08-1.25)^a

1.14 (1.03-1.23)^b

7.40

1.59 (1.52-1.67)^a

1.60 (1.52-1.68)^a

Income

Top

4.46

1

1

5.10

1

1

Fourth

5.07

1.14 (1.01-1.29)^c

1.11 (0.97-1.26)

5.57

1.09 (1.03-1.16)^b

1.01 (0.95-1.07)

Midlle

5.15

1.16 (1.03-1.30)^c

1.11 (0.97-1.25)

5.97

1.18 (1.11-1.25)^a

1.07 (1.01-1.14)^c

Second

5.08

1.15 (1.02-1.28)^c

1.08 (0.95-1.23)

6.05

1.20 (1.13-1.27)^a

1.04 (0.98-1.11)

Bottom

5.28

1.19 (1.08-1.32)^b

1.07 (0.95-1.21)

6.50

1.29 (1.22-1.37)^a

1.13 (1.06-1.20)^a