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Table 1 Characteristics of the study population of term born infants and their mothers

From: Investigating the association between birth weight and complementary air pollution metrics: a cohort study

Subject characteristics

Number of subjects

Mean birth weight (g)

Standard deviation in birth weight (g)

% of infants with a low birth weight (<2,500 g)

Infant’s gender

    

Female

36,133

3,408.2

459.7

2.09

Male

38,283

3,527.5

473.5

1.35

Race/ethnicity of mothers

    

AfricanAm

6,261

3,329.7

475.2

3.19

Asian

7,358

3,314.7

444.2

2.57

Hispanic

23,678

3,469.0

461.7

1.59

Caucasian

30,548

3,542.4

464.4

1.23

Mixed

322

3,473.2

458.2

0.93

Other

3,095

3,413.4

483.2

2.23

Missing

3,154

3,462.3

479.8

1.84

Insurance status of mothers

    

Private

50,880

3,490.7

468.1

1.53

Public

20,525

3,418.5

475.9

2.2

Missing

3,011

3,460.2

450.3

1.3

Chronic hypertension in mothers

    

No

74,138

3,469.8

470.3

1.7

Yes

278

3,395.9

551.7

3.96

Heart diseases in mothers

    

No

74,333

3,469.7

470.6

1.7

Yes

83

3,309.7

511.1

6.02

Preeclampsia in mothers

    

No

72,760

3,473.0

467.6

1.58

Yes

1656

3,319.4

570.2

7.37

Diabetes in mothers

    

No

70,622

3,463.5

465.6

1.73

Yes

3794

3,582.5

544.6

1.34

Maternal weight gain during pregnancy

    

Low (<15 lbs)

1286

3,376.1

491.1

3.34

Medium

57,727

3,445.9

463.2

1.79

High (>30 lbs)

15,397

3,566.1

483.5

1.24

Missing

6

2,978.8

686.4

0.08

Parity

    

First delivery

60,382

3,458.3

471.4

1.81

At least second delivery

14,034

3,518.0

464.4

1.26