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Three forest plots of the change in anxiety in subgroup analysis by stand density: low (<500/ha), high (1000–1500/ha), extremely high (1500/ha≤). The data are reported as standardized mean differences (SMD) and 95% confidence intervals (CIs). The diamond at the bottom presents the overall effect. The plotted squares denote SMD, and the whiskers denote their 95% CIs.
