Table 1 Preterm delivery according to some demographic characteristics, gestational age and determining factor

Total

2,771

100.0

11.5

(10.3–12.9)

 North

300

10.9

13.0

(8.5–19.5)

 Northeast

901

32.5

12.9

(10.1–16.4)

 Southeast

1,062

38.3

10.4

(8.9–12.1)

 South

336

12.1

11.2

(9.6–12.9)

 Midwest

172

6.2

11.0

(8.5–14.0)

 State capital

1,253

45.2

14.0

(11.5–17.0)

 Non state capital

1,518

54.8

10.1

(8.9–11.3)

 Public

2,191

79.1

11.4

(10.1–12.9)

 Private

580

20.9

11.9

(9.5–15.0)

  < 28

100

3.6

0.4

(0.3–0.6)

 28–31

333

12.0

1.4

(1.0–1.9)

 32–33

288

10.4

1.2

(0.9–1.5)

 34–36

2,050

74.0

8.5

(7.7–9.4)

 Spontaneous/pPROM

1,681

60.7

7.0

(6.2–7.9)

  Intact membranes

660

23.8

2.7

(2.3–3.2)

  pPROM

1,021

36.9

4.2

(3.8–4.7)

 Provider-initiated

1,090

39.3

4.5

(4.1–5.1)

  Labor induction

60

2.2

0.2

(0.1–0.8)

  Prelabor Cesarean

1,030

37.2

4.3

(4.0–4.7)