Fig. 7From: A systematic review and meta-analysis of blood interleukin-4 levels concerning malaria infection and severityThe contour-enhanced funnel plot revealed that the mean differences of IL-4 levels between severe and uncomplicated malaria patients were concentrated in a statistically significant area (P < 1%, 0.01), indicating that the asymmetry in the funnel plot was caused by publication bias rather than other factorsBack to article page