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

From: Prevalence and risk factors related to preterm birth in Brazil

  n % rate 95 % CI
Total 2,771 100.0 11.5 (10.3–12.9)
Region
 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)
Locality
 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)
Childbirth healthcare
 Public 2,191 79.1 11.4 (10.1–12.9)
 Private 580 20.9 11.9 (9.5–15.0)
Gestational age (weeks) a
  < 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)
Determining factora
 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)
  1. aFor each category the rate is based on the total number of live births, of 24,042