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Table 1 Preterm birth (PTB) rates by maternal characteristic, Québec, 1989-2006

From: Association between maternal comorbidity and preterm birth by severity and clinical subtype: retrospective cohort study

  All PTB % Medically indicated % PPROM* % Spontaneous % Total births
Maternal age      
   < 20 years 8.4 1.9 2.1 4.3 56,647
   20-24 years 6.7 1.7 2.0 3.0 260,848
   25-29 years 5.8 1.6 1.8 2.4 487,831
   30-34 years 5.7 1.8 1.8 2.2 373,906
   35-39 years 6.9 2.4 2.2 2.3 130,525
   ≥ 40 years 8.6 3.5 2.6 2.5 19,979
Grand multiparity 6.1 1.7 1.7 2.7 6,010
Period      
   1989-1993 5.9 1.6 1.7 2.7 454,300
   1994-1997 6.3 1.8 1.9 2.6 321,884
   1998-2001 6.4 1.9 2.1 2.5 276,252
   2002-2006 6.5 2.1 2.1 2.3 277,301
Comorbidity      
   Systemic 8.7 4.1 2.2 2.4 323,433
   Localized 10.9 4.9 2.9 3.0 241,580
   No 4.7 0.5 1.7 2.4 839,539
Total 6.2 1.8 1.9 2.5 1,329,737
  1. * Preterm premature rupture of membranes
  2. † Spontaneous preterm labour before 37 gestational weeks with intact membranes