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(a) Comparison of the fall incidence between the feet-forward slips and the split slips (included both the fall and recovery outcomes), chi-square test was performed on the fall incidence between the two slip types. (b) Comparison of the stability at LLO between the feet-forward slips and the split slips, an independent t-test was performed on stability between these two slip types. * indicates a significance level of p < 0.05, ** p < 0.01 and *** p < 0.001.
