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Forest plot showing meta-analysis of proportion of Echinacea-treated subjects with ≥1 RTI compared with control (for clearer Abbey and Funnel plots see Appendix B Figure A4 and Figure A5). Shown are “events” (pts with RTIs), “total” (participants) for Echinacea (“experimental”) and control, risk ratios (RR) employing a common and random effect model, heterogeneity (I2), confidence intervals (95%-CI), p-value and individual weight of respective studies.
