Timing for green prescription: comparing the immediate and cumulative effects of different duration horticultural therapy programs on college students' mental health.

For PML, both groups showed an increasing trend that stabilized after the intervention ( Figure 4a ).

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Regarding cumulative effects, both the short-duration (4-week) and long-duration (8-week) programs produced within-group reductions in anxiety and depressive symptoms, although the between-group difference in effect sizes did not reach statistical significance.

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