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Figure 4 | BMC Psychiatry

Figure 4

From: Air ions and mood outcomes: a review and meta-analysis

Figure 4

Visual Assessment of Publication Bias Using a Funnel Plot (SIGH-SAD composite scores). *A clustering indicative of publication bias around the mean treatment effect was not observed (i.e., no marked asymmetry was evident). In the absence of publication bias we would expect the studies to be distributed symmetrically about the combined treatment effect.

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