Baseline Characteristics of Participants
Frailty
Abbreviation: PBT, perturbation-based balance training.Tilburg Frailty Indicator: score range of 0 to 15, with a lower score indicating less frailty.Vulnerable Elders-13 Survey: score range of 0 to 10, with a lower score indicating less vulnerable.Short Falls Efficacy Scale: score range of 7 to 28, with a lower score indicating less concern about falling.Short Orientation-Memory-Concentration Test: score range of 0 to 28, with a higher score indicating better performance.Short Physical Performance Battery: score range of 0 to 12, with a higher score indicating better performance.Time to complete the Trail Making Test Part A was subtracted from Part B time, with less time indicating better executive function.The PBT group completed 90% and the control group completed 93% of the assigned training sessions. At least 75% (per-protocol criterion) of the training sessions were completed by 90% of the PBT group and 97% of the control group.At 12 months, the PBT group had returned 99% (71.5 person-years) and the control group had returned 97% (70.4 person-years) of fall calendars. Nineteen participants (27%) in the PBT group and 25 participants (36%) in the control group had missing laboratory fall data. Data were treated as missing at random because the reasons for missing data and the demographic characteristics of participants with missing data were similar between the 2 groups (eTables 1 and 2 in 