Fig. 3

SMD values and 95% CI for dynamic balance tests. AP anteroposterior, APSI anteroposterior stability index, AP-TTB anteroposterior time to boundary, CAI chronic ankle instability, CI confidence interval, CON control, COP centre of pressure, ML mediolateral, MLSI mediolateral stability index, ML-TTB mediolateral time to boundary, SD standard deviation, SI stability index, SMD standardised mean difference. In the study by Simpson et al. [15], negative SMD indicates balance deficits in CAI. In other three studies [31, 37, 50], positive SMD indicates balance deficits in CAI