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Table 1 Maternal Characteristics, Ohio 2007–2010

From: Exposure to airborne particulate matter during pregnancy is associated with preterm birth: a population-based cohort study

 

Preterm (%) N = 19,027

Term (%) N = 205,894

p-value

Total births (%) N = 224,921

Demographic factors

    

 Advanced maternal age

    

  35 – 39 years

1901 (10.0)

19,302 (9.4)

<0.01

21,203 (9.4)

  ≥40 years

482 (2.5)

3952 (1.9)

 

4434 (2.0)

 Race and ethnicity

    

  Non-Hispanic White

9940 (52.7)

127,636 (62.6)

<0.01

137,576 (61.2)

  Non-Hispanic Black

7507 (39.8)

59,630 (29.2)

 

67,137 (30.1)

  Hispanic

937 (5.0)

10,583 (5.2)

 

11,520 (5.2)

  Other

457 (2.4)

6.116 (3.0)

 

6573 (2.9)

Social behaviors & socioeconomic factors

    

 Education

    

  Less than high school

4778 (25.4)

40,658 (19.9)

<0.01

45,436 (20.4)

  High school graduate

5127 (27.3)

50,721 (24.9)

 

55,848 (25.1)

  Some postsecondary

8875 (47.3)

112,590 (55.2)

 

121,465 (54.5)

 Tobacco use

4568 (24.0)

38,292 (18.6)

<0.01

42,860 (19.1)

 Medicaid insurance

9672 (50.8)

87,631 (42.6)

<0.01

97,303 (43.3)

Prenatal care initiation

    

 First trimester

8051 (61.6)

103,232 (67.7)

<0.01

111,283 (67.2)

 Second trimester

3219 (24.6)

36,882 (24.2)

 

40,101 (24.2)

 Third trimester

708 (5.4)

7897 (5.2)

 

8605 (5.2)

 No prenatal care

1092 (8.4)

4422 (2.9)

 

5514 (3.3)

Year of birth

    

 2007

5234 (27.5)

55,325 (26.9)

0.01

60,559 (26.9)

 2008

4969 (26.1)

52,708 (25.6)

 

57,677 (25.6)

 2009

4600 (24.2)

50,364 (24.5)

 

54,964 (24.4)

 2010

4225 (22.2)

47,497 (23.1)

 

51,721 (23.0)

Season

    

 Winter

4755 (25.0)

50,205 (24.4)

0.26

54,960 (24.4)

 Spring

4787 (25.1)

51,827 (25.2)

 

56,614 (25.2)

 Summer

4835 (25.4)

53,173 (25.8)

 

58,008 (25.8)

 Fall

4650 (24.4)

50,689 (24.6)

 

55,339 (24.6)

  1. Dichotomous variables for first 2 columns are presented as percent of total for each characteristic
  2. Continuous variables are presented as median (IQR) for non-normally distributed data and mean +/- standard deviation for normally distributed data