Table 3.

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

Item	Relative risk (95% CI)*	P value
Deprivation index	1.014 (1.012 to 1.016)	<0.0001
Spearhead status	1.275 (1.208 to 1.345)	<0.0001
Birth rate by ethnicity†:
Mixed race	1.138 (1.097 to 1.182)	<0.0001
Black	1.067 (1.049 to 1.085)	<0.0001
Indian	1.072 (1.052 to 1.091)	<0.0001
Pakistani	1.072 (1.058 to 1.086)	<0.0001
Bangladeshi or other Asian	1.079 (1.058 to 1.101)	<0.0001
Chinese‡	1.34×104 (1.16 to 1.56×107)	0.009
Maternity spend per birth over 3 year period†	0.764 (0.683 to 0.855)	<0.0001
Yearly maternity spend by year†	0.916 (0.836 to 1.047)	0.056
Birth rate by maternal age:
<16 years‡	1.53×1017 (2.58×108 to 9.08×1025)	0.0001
<18 years†	1.199 (1.137 to 1.265)	<0.0001
>35 years†	0.649 (0.595 to 0.709)	<0.0001

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

†Log transformed rate.

‡Log transformed (fractional rate+1).