Sample size and randomisation
Sample size was calculated in G*power 3.1.9.2 and was based on the primary outcome of this study, difference between group means on balance measured with the Mini-BESTest post-intervention. The effect size Participants were randomised using a 1:1 ratio stratified block randomisation (block sizes 2 and 4). Randomisation was stratified based on sex (male/female) and number of falls during the previous year (1 versus 2 or more falls). The randomisation sequence was generated by an independent researcher using an online random number generator. Participants were enrolled and allocated to their groups by the main researcher. Allocation was concealed by using sequentially numbered, sealed opaque envelopes. The allocation sequence list was kept in a locked drawer, which could only be accessed by the principal investigator.