Fig. 4.

(Continued from previous page) Pooled estimates for the weighted mean differences (WMD, kg) of postpartum weight retention between women whose pre-pregnancy BMI was less than 18·5 kg/m² (a), 25·0–29·9 kg/m² (b) or ≥30·0 kg/m² (c) and women whose pre-pregnancy BMI was 18·5–24·9 kg/m². The study-specific WMD and 95 % CI are represented by the grey square and horizontal line, respectively; the size of the data marker (grey square) is proportional to the weight of the study in the meta-analysis. The centre of the open diamond presents the pooled WMD and its width represents the pooled 95 % CI