Figure legends
Figure 1. Search plot diagram.
Figure 2. Forest plot and contour enhanced funnel plot (preeclampsia vs control). Forest plot: Vertical line = ”no difference” point between the two groups. Green squares = risk ratios; Diamonds = pooled mean differences and 95 confidence intervals for all studies; Horizontal black lines = 95% CI; Horizontal red line = 95% prediction intervals. Contour enhnanced funnel plot: 95% CI per level of statistical significance, white color: p>.05, navy blue: p<.05 , blue: p<.025 , light blue:p<.01 ).
Figure 3. Forest plot and contour enhanced funnel plot (mild preeclampsia vs severe preeclampsia). Forest plot: Vertical line = ”no difference” point between the two groups. Green squares = risk ratios; Diamonds = pooled mean differences and 95 confidence intervals for all studies; Horizontal black lines = 95% CI; Horizontal red line = 95% prediction intervals. Contour enhnanced funnel plot: 95% CI per level of statistical significance, white color: p>.05,navy blue: p<.05 , blue: p<.025 , light blue: p<.01 ).