Table 3.

Predicted incidence rate ratios (IRR) of infant mortality events obtained from negative binomial regression modelling using SIMD-IE

	Model explanatory variables
	Year	SIMD-IE Quintile	Infant sex	Maternal age
Reference category	2000	5 (least deprived)	Female	25–34 years
IRR for	Unit increase	Unit increase	Male	< 25 years	≥ 35 years
Infant mortality	0.97 * (0.96–0.97)	1.16 * (1.13–1.19)	1.22 * (1.15–1.30)	1.24 * (1.16–1.34)	1.16 * (1.07–1.26)
Neonatal mortality	0.97 * (0.96–0.97)	1.12 * (1.09–1.15)	1.20 * (1.12–1.30)	1.16 * (1.06–1.27)	1.18 * (1.07–1.30)
Post-neonatal mortality	0.97 * (0.96–0.98)	1.25 * (1.20–1.31)	1.26 * (1.13–1.40)	1.42 * (1.26–1.60)	1.12 (0.96–1.30)
Stillbirths	0.98 * (0.97–0.98)	1.13 * (1.11–1.15)	0.99 (0.94–1.05)	1.12 * (1.04–1.20)	1.37 * (1.28–1.47)
Extended perinatal mortality	0.97 * (0.97–0.98)	1.13 * (1.11–1.14)	1.06 * (1.02–1.11)	1.13 * (1.07–1.20)	1.30 * (1.23–1.38)

* p-value < 0.001