Figure 4. Forest plots of the meta-analysis for SMD in the magnitude of peak GRF during landing (left side) and funnel plots of standard error by each direction of peak GRF for the studies included in the meta-analysis (right side). For Brown et al 2008 a, b, c, and d refer to two different landing tasks and three groups (MI, FI, and coper) by the same study: a was compared FI and coper during single-leg drop jump landing; b was compared FI and coper during running stop jump landing; c was compared MI and coper during single-leg drop jump landing; d was compared MI and coper during running stop jump landing. Abbreviations: CI, confidence interval; FE, fixed-effects; FI, functional instability; MI, mechanical instability; SMD, standardized mean difference.