Table 3.

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

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)

*Maternal age was not available for 90/246 deceased infants.

**Corrected assuming that infant deaths with missing maternal age were distributed like the deaths in the same district where maternal age was available.

***Estimated from a Poisson regression model, including term for district, maternal age and their interaction.