Randomisation
Randomisation was performed after baseline assessment and obtaining consent. A secure internet based system using a dynamic, adaptive allocation (minimisation) algorithm, accessed by a secure web portal held at the North Wales Organisation for Randomised Trials in Health Clinical Trials Unit, Bangor University, was used to randomise individuals, 1:1, stratified by site, presence of a co-resident, and history of previous falls. The adaptive allocation algorithm used a dynamic method of calculating allocation probabilities—that is, the probability of allocation to each group was not fixed (eg, 0.5) but was recalculated for every participant on the basis of participants already allocated. This method protects against subversion while ensuring that the trial maintains good balance to the allocation ratio of 1:1, both within each stratification variable and across the trial.