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Figure 1 | BMC Psychiatry

Figure 1

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

Figure 1

High-Density Negative Air Ion Exposure and Depression. *Includes data from studies at the last follow-up time point where applicable [68]; p for heterogeneity (composite SIGH-SAD) = 0.94. CI: Confidence Interval; SIGH-SAD: Structured Interview Guide for the Hamilton Depression Rating Scale, Seasonal Affective Disorders.

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