Funnel plots of Meta-analysis in different particular matters to different stroke types.

<p>OR indicates odds ratio. (A) Funnel plot of Meta-analysis of PM_2.5 exposure to stroke attack. (B) Funnel plot of Meta-analysis of PM₁₀ exposure to stroke attack. (C) Funnel plot of Meta-analysis of PM₁₀ exposure to hemorrhagic stroke attack. (D) Funnel plot of Meta-analysis of PM_2.5 exposure to ischemic stroke attack. (E) Funnel plot of Meta-analysis of PM₁₀ exposure to ischemic stroke attack.