Fig. 1

Partial effects of age at survey time (left panel) and age at first cohabitation (right panel) based on the best fitting model, i.e. CAR model adjusting all the covariates presented in Table 3. The blue points are the posterior mean estimates of the random effects for the age variables and the black vertical lines are the 95% point-wise confidence intervals. R [32] package ggplot2 [34] was used to generate the graphs