The pooled (weighted average) effect sizes (Hedges g) and 95% CI for each outcome. The sign of the effect size reflects the benefit on health (positive effects indicate greater attention, energy and tranquillity but lower values for the other outcomes). In brackets are shown the number of studies that was used to calculate the effect size and an asterisk is used to denote significant heterogeneity (p < 0.05) within a particular group.
Bowler et al. BMC Public Health 2010 10:456 doi:10.1186/1471-2458-10-456