Figure 1 Comparison of placental weight between controls and women with different grades of preeclampsia. Data are expressed as mean±SD. Data were analyzed by one-way analysis of variance test followed by Bonferroni’s multiple comparison test. (a) Significantly different from mild preeclampsia; and (b) significantly different from moderate preeclampsia. Significant difference from the control group. **P<0.01; ***P<0.001.