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Table 3 Maternal age-specific IMR estimates by district of residence and infant mortality rate ratio estimates

From: A retrospective follow up study on maternal age and infant mortality in two Sicilian districts

District   Maternal age
   <25 25-29 30-34 35-39 > = 40
Messina Infant deaths*/live births 4/2418 8/4435 24/5917 10/3153 10/742
  IMR (×1000) 1.6 1.8 4.1 3.2 13.5
  Corrected** IMR (×1000) 2.9 3.2 7.2 5.6 23.8
Palermo Infant deaths*/live births 11/7175 29/11622 39/13116 13/6803 8/1426
  IMR (×1000) 1.5 2.5 3.0 1.9 5.6
  Corrected** IMR (×1000) 2.3 3.7 4.4 2.8 8.2
Messina Rate Ratio*** (95% CI) 1.1 (0.3-3.4) 1.2 (0.5-2.9) 2.6 (1.3-5.4) 2.1 (0.9-4.9) 8.8 (3.7-20.7)
Palermo Rate Ratio*** (95% CI) 1 (Ref.) 1.6 (0.8-3.3) 1.9 (0.1-3.8) 1.2 (0.6-2.8) 3.7 (1.5-9.1)
  1. *Maternal age was not available for 90/246 deceased infants.
  2. **Corrected assuming that infant deaths with missing maternal age were distributed like the deaths in the same district where maternal age was available.
  3. ***Estimated from a Poisson regression model, including term for district, maternal age and their interaction.