Fig. 3

Predicted probability of hospital birth by travel time to the nearest hospital and household wealth index ^{^}. ^{^} Model covariates – maternal education, maternal age at birth and birth order – were set to sample mean. Random effect at the survey cluster level was applied. All the observed combinations of values between travel time and wealth index were contained within the border. The colour gradient represents the value of the predicted probability of hospital birth (red: highest probabilities; blue: lowest probabilities). Contour lines are drawn to connect points that have the same predicted values. We drew contour lines for each 2.5% point increment in the predicted probabilities of hospital birth