Wallsten 2006.

Methods	Type of study: RCT
Participants	Number of participants randomised: 77 Losses: confusing ‐ state 31 withdrew in table (46 remain), but present data suggesting 53 remain Age: mean (range) 81.2 (61 to 92 yrs) Sex: men N = 20; women N = 57. Setting: USA. Health status as defined by authors: healthy Residential status of participants: independently in continuing care retirement community Inclusion: Community dwelling, GP approval Exclusion: history of hip fracture or hip or knee replacement; Parkinsons Disease, stroke or other neurological disease, receiving therapy for cancer; using assistive devices for walking more than 25 feet.
Interventions	EXERCISE GROUP(3D): (n = 41) Tai Chi Chuan Moderate (10 same forms used by Wolf 1997). CONTROL GROUP (n = 36): usual activities Duration and intensity: 20 weeks, 2 times 1 hour per week Supervisor: Tai Chi instructor. Supervision: group exercise sessions. Setting: Room in retirement community.
Outcomes	Timed Up and Go as part of an "Overall Performance Score" This is an overall performance score result of combining and summing results of the following tests:10m walk; TUG; side by side stance; semi tandem stance; tandem stance. Compliance/adherence: not reported Adverse events:not reported
Notes	Also looked at detraining. All benefit lost 20 weeks after the intervention. Control group undertook Tai Chi at the end of the 20 weeks intervention.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Insufficient information to permit judgement
Allocation concealment (selection bias)	Unclear risk	Insufficient information to permit judgement
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Insufficient reporting of attrition/exclusions to permit judgement N = 24 missing balance measures, no explanation
Selective reporting (reporting bias)	Unclear risk	Insufficient information to permit judgement
Other bias	High risk	Balance measures reported on incomplete data set
Blinding (participant)	High risk	Not possible
Blinding (assessor)	Unclear risk	Insufficient information to permit judgement
Were the treatment and control group comparable at entry?	Unclear risk	Balance measures not considered, but no differences in age, height and weight
Was the surveillance active, and of clinically appropriate duration (i.e. at least 3 months post intervention)?	Low risk	Measurements made at 20 weeks post intervention to look at detraining