Table 7

Explanatory models for trends on MMR, MMR_AO and iAMR in 32 Mexican states after refinement, 2002–2011

	MMR†						MMR_AO‡						iAMR§
	β	SE	95% CI		P value	VIF	β	SE	95% CI		P value	VIF	β	SE	95% CI		P value	VIF
	β	SE	Lower	Upper	P value	VIF	β	SE	Lower	Upper	P value	VIF	β	SE	Lower	Upper	P value	VIF
Female literacy (%)	−1.100	0.255	−1.625	−0.574	<0.001	2.250	−0.073	0.024	−0.122	−0.023	0.005	1.014	−0.119	0.018	−0.155	−0.082	<0.001	1.944
Low birth weight (%)	1.637	0.502	0.603	2.671	0.003	1.046	0.361	0.072	0.213	0.508	<0.001	1.013	0.154	0.039	0.074	0.234	0.001	1.051
Skilled attendance at birth (%)	−0.162	0.157	−0.486	0.162	0.312	1.145	−0.065	0.021	−0.108	−0.022	0.005	1.011	−0.052	0.011	−0.075	−0.030	<0.001	1.061
Intimate-partner violence (%)	0.755	0.369	−0.004	1.514	0.051	1.859	0.021	0.055	−0.092	0.135	0.702	1.961	0.085	0.029	0.025	0.144	0.007	2.023
All-abortion hospitalisation ratio (per 100 live births)	−0.817	0.405	−1.652	0.018	0.055	1.882	0.036	0.056	−0.080	0.151	0.533	1.742	−0.004	0.030	−0.067	0.058	0.894	1.854
Constitutional amendment (yes)	0.578	1.827	−3.192	4.348	0.755	1.088	0.286	0.243	−0.214	0.787	0.250	1.019	−0.034	0.137	−0.318	0.250	0.806	1.081
Abortion legislation (less permissive)	−1.456	2.151	−5.896	2.983	0.505	1.531	−0.062	0.279	−0.636	0.513	0.827	1.276	−0.059	0.155	−0.380	0.262	0.705	1.393
Contraceptive use (%)	0.187	0.259	−0.347	0.720	0.477	3.182	0.044	0.032	−0.022	0.111	0.184	2.761	0.023	0.020	−0.018	0.064	0.255	3.622
R² for model	0.689*						0.624*						0.777*

*p<0.001.
†Multivariate model identified and excluded two states (Chihuahua and Nueva León) as outliers after one step of refinement. Four predictors were identified after five steps of backward elimination (female literacy, low birth weight, all-abortion hospitalisation ratio and intimate-partner violence), accounting for 69% (R²) of the differences in MMR between states.
‡Multivariate model identified and excluded two states (Aguascalientes and Nayarit) as outliers after two steps of refinement. Three predictors were identified after six steps of backward elimination (female literacy, low birth weight and skilled attendance at birth), accounting for 62% (R²) of the differences in MMR_AO between states.
§Multivariate model identified and excluded four states (Aguascalientes, Durango, Sonora and Tlaxcala) as outliers after three steps of refinement. Four predictors were identified after five steps of backward elimination (female literacy, low birth weight, skilled attendance at birth and intimate-partner violence), accounting for 78% (R²) of the differences in iAMR between states.
iAMR, induced abortion mortality ratio; MMR, maternal mortality ratio; MMR_AO, MMR with abortive outcome; VIF, variance inflation factor.