Can Different Forest Structures Lead to Different Levels of Therapeutic Effects? A Systematic Review and Meta-Analysis.

As a result of subgroup analysis, there was a marginally significant difference in the effect size according to the stand density (P subgroup = 0.0778; Figure 3 ). “Medium” effect in low-density (SMD −0.73; 95% CI −1.25 to −0.20; p = 0.0067; I 2 = 54%) appeared, however, no significant effect was shown in high-density environments (SMD −0.31; 95% CI −0.64 to 0.01; p = 0.0594; I 2 = 81%) and extremely high-density environments (SMD −0.12; 95% CI −0.27 to 0.02; p = 0.1034; I 2 = 0%).

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