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Table 1 Description of variables in analytic sample, Santiago, Chile, 2004

From: Multi-level modeling of social factors and preterm delivery in Santiago de Chile

Continuous Birth Outcome Variable

N

Mean

SD

Min

Max

Weeks of gestational age at birth

56868

38.62

1.80

20

43

Weight at birth in grams

56900

3344.96

529.01

508

6060

Length at birth in cm

56873

49.54

2.51

30

61

Maternal Age at birth (years)

56965

27.86

6.68

11

51

Maternal Years of Education

56966

12.31

3.37

0

22

Continuous Census District Variable

N

Mean

SD

Min

Max

Number of domiciles per capita

56963

0.27

0.06

0.09

0.73

% domiciles connected to sewer

56963

25.17

3.92

8.03

50.16

ln(average total valuation/m2)

56900

10.78

0.88

8.16

14.88

% population non-indigenous

56963

96.65

1.58

90.71

99.32

% population with formal schooling

56963

98.64

0.67

95.99

99.88

% not unemployed and seeking work

56963

95.42

0.99

92.36

99.02

% population owners or employers

56963

1.91

1.19

0.15

9.78

% domiciles with concrete paving

56963

2.19

4.94

0.00

30.43

% domiciles with indoor plumbing

56963

25.20

3.91

8.03

50.16

% domiciles with indoor heating.

56963

21.22

4.84

6.52

36.03

Census District SES Score1

56894

0.00

1.00

-2.15

4.70

 

In Full Sample

 

Ages 20+ Only 2

Categorical Birth Outcome Variable

N

%

 

N

%

Male Sex of Newborn

56970

51.05

 

49771

51.19

Medical Attention at Birth

56970

99.96

 

49771

99.96

Mother Married at time of Birth

56970

53.31

 

49771

47.60

Preterm Deliver (< 37 wks)

56868

6.41

 

49674

6.29

Low Birth Weight (< 2500 g)

56900

4.94

 

49707

4.80

Preterm LBW (< 2500 g, <37 wks)

56802

3.33

 

49613

3.27

Very Low Birth Weight (< 1500 g)

56900

0.86

 

49707

0.86

  1. 1 based on principal components analysis of 10 census items
  2. 2 for comparison with Figure 1