2.6. Statistical Analyses

The existence of possible effects associated with VR exposure on postural sway and SSQ scores was investigated by means of a two-way analysis of variance for repeated measures (RM-ANOVA), considering the group (unaffected individuals; MS with low disability; and MS with mild–moderate disability) and time (pre-VR; post-VR; and follow-up) as independent variables and the 6 previously listed sway parameters or the SSQ scores as dependent variables (in this case, the analysis was performed at sub scores and total score level). The level of significance was set at p = 0.05. When relevant, post hoc Holm–Sidak tests for pairwise comparison were used to assess intra- and inter-group differences. All the analyses were performed using IBM SPSS Statistics v.20 software (IBM, Armonk, NY, USA).