Table 1 Distribution of maternal sociodemographic characteristics by dental treatment type (n = 32,168)

Number of subjects (%)

32,168 (100.0)

13,575 (42.2)

2895 (9.0)

13,246 (41.2)

2452 (7.6)

Maternal age (years)

  < 20

2.6

3.4

1.6

1.9

2.7

 20–24

10.8

12.5

13.9

7.6

15.3

 25–29

26.0

26.9

31.8

23.1

29.9

 30–34

34.3

32.7

28.5

37.7

31.5

  ≥ 35

26.3

24.4

24.2

29.6

20.6

 Mean age (SD)

30.8 (5.6)

30.4 (5.8)

30.2 (5.5)

31.6 (5.3)

29.9 (5.7)

Primiparity

32.2

31.4

31.8

33.5

30.0

Household Annual income (US $; quintile)

 1st (≤28,125)

6.3

6.7

9.0

5.2

6.6

 2nd (28,126 to 33,500)

7.3

7.8

10.5

5.8

8.4

 3rd (33,501 to 39,283)

10.5

11.0

10.7

9.5

13.4

 4th (39,284 to 48,831)

20.6

20.3

22.7

19.9

23.4

 5th (≥48,832)

55.3

54.2

47.2

59.6

48.1

 Median income (US $; range)

50,991 (5000 to 200,000)

50,555 (5787 to 209,001)

47,153 (7436 to 200,001)

52,800 (5000 to 173,368)

47,683 (7236 to 185,466)

Black race (%)

  ≤ 10

70.0

66.3

71.7

73.8

67.9

 11–35

20.5

21.8

19.7

19.0

22.8

 36–50

2.8

3.1

2.9

2.4

3.6

  ≥ 51

6.6

8.8

5.6

4.7

5.8

 Median (range) %

5 (0, 99)

6 (0, 99)

5 (0, 98)

5 (0, 99)

5 (0, 98)

Hispanic ethnicity (%)

  ≤ 5

40.4

39.1

31.8

44.4

36.8

 6–10

19.8

18.9

22.8

20.1

19.5

 11–20

18.3

18.6

18.9

17.9

18.5

 21–42

13.0

13.3

16.1

11.6

15.0

  ≥ 43

8.4

10.1

10.3

6.0

10.2

 Median (range) %

8 (0, 100)

8 (0, 100)

9 (0, 99)

7 (0, 100)

9 (0, 97)

Complications of pregnancy (%)^a

33.9

34.0

34.6

33.1

36.5

Dental enrollment months, Median (range)

28 (1, 46)

22 (1, 46)

33 (1, 46)

32 (1, 46)

29 (1, 46)