Boehm 2011.

Methods	Cross‐over design. Random allocation generated and implemented by trial coordinator. Analysed on a per protocol basis. Treated for 12 weeks. Assessed at baseline, 12 weeks, and 24 weeks. Assessors were blinded for UPDRS III evaluation.
Participants	55 participants in sensory attention focused exercise group (SAFE) and 55 in control group . 5 dropouts in SAFE group, 3 dropouts in control group. Participants' mean age 67.4 years (SAFE), 65.8 years (control); male/female 28/22 (SAFE), 30/22 (control); Hoehn and Yahr stage not stated; duration of PD 5.4 years (SAFE), 5.2 years (control). Inclusion criteria: idiopathic Parkinson's disease diagnosed by neurologist or movement disorders specialist according to international clinical diagnosis criteria, able to commit to study guidelines for 24 weeks. Exclusion criteria: score lower than 76 on 3MS (extended MMSE).
Interventions	Sensory attention focused exercise. Control: no intervention. Drug therapy was not described.
Outcomes	UPDRS I, II, & III. Timed up and go. Step length. Step length variability. Gait speed. Grooved peg‐board. 30 second chair stand.
Notes	Abstract and unpublished data. Baseline characteristics do not include dropouts.
Risk of bias
Bias	Authors' judgement	Support for judgement
Eligibility Criteria	Low risk	Eligibility criteria stated.
Randomisation Method	Unclear risk	Randomisation method not clear.
Concealment of Allocation	Unclear risk	Randomisation method not clear.
Similarity at Baseline	Low risk
Withdrawals Described	Low risk	Withdrawals at 7%.
Intention To Treat Analysis	Low risk	Analysed on a per protocol basis.
Cointerventions Constant	Low risk	Drug therapy constant.
Blinded Assessors	Low risk	Assessors were blinded for UPDRS III evaluation.