Fig. 1.

Predicted number of children (y-axis) by woman’s educational level (x-axis) with 95 % confidence level intervals for pair-wise comparisons. Note: Predictions are obtained using estimates from a multilevel Poisson’s regression model (Model 1, Table 3). Confidence intervals are centered on the predictions and have lengths equals to 2 × 1.39 × standard errors to have an average level of 5 % for the Type I error probability in the pair-wise comparisons of a group of means (Goldstein and Healy 1995)