Pathway modelling using autoregressive integrated moving average (ARIMA) models for assessing the different predictors of the maternal mortality ratio in a time series from 1957 to 2007 in Chile.

β is the regression coefficient or the estimate of the average change in the maternal mortality ratio per 100,000 live births per unit of change in the independent variable. GDI (Gross Domestic Income) refers to the Gross Domestic Product per 1,000 US dollars. The pathway modelling approach is as follows: Model 1 adjusted for the initial slope in 1957; Model 2 is Model 1 adjusted for the average number of schooling years; Model 3 is Model 2 additionally adjusted for the join point and the slope for the segment from 1965; and Model 4 is Model 3 adjusted for the join point and the slope for the segment from 1981.