Table 5.

 Predictors of perinatal mortality by primary care trust in England—multivariable model

Effect	Relative risk (95% CI)*	P value
Intercept	5.990 (5.131 to 6.992)	<0.0001
Deprivation index	1.006 (1.003 to 1.008)	<0.0001
Birth rate by Pakistani ethnic group†	1.019 (1.003 to 1.036)	0.0197
Birth rate by black ethnic group†	1.047 (1.027 to 1.069)	<0.0001
Birth rate by maternal age >35 years†	0.742 (0.667 to 0.824)	<0.0001

*Relative risk of a unit change in the X value (that is, antilog of parameter estimate).

†Log transformed rate.

Extra-Poisson variance explained in final model = 80.5%.