de Bruin 2010b.

Methods	Parallel group design. Method of randomisation was not stated. Method of analysis not described. Treated as outpatient 3 times per week for 13 weeks. Assessed at baseline and post intervention. Not stated whether assessors were blinded.
Participants	8 participants in the cueing group and 5 participants in the control group. No dropouts described. No baseline characteristics reported. Inclusion criteria: Parkinson's disease. No exclusion criteria.
Interventions	Cueing: Walking 3 times per week while listening to an individual music playlist. Playlists closely matched each individual's music preferences and preferred cadence. Control: Continued with their regular activities. Drug therapy was not described.
Outcomes	Spatiotemporal parameters approach, crossing and recovery steps of obstacle crossing were evaluated using a GAITRite mat. Step speed. Step length. Not stated when during the day examinations took place.
Notes	Abstract, only P values reported.
Risk of bias
Bias	Authors' judgement	Support for judgement
Randomisation Method	Unclear risk	Randomisation method was not stated.
Concealment of Allocation	Unclear risk	Randomisation method was not stated.
Similarity at Baseline	Unclear risk	No baseline characteristics reported.
Withdrawals Described	Unclear risk	No drop‐outs described.
Intention To Treat Analysis	Unclear risk	Method of analysis not described.
Cointerventions Constant	Unclear risk	Drug therapy was not described.
Blinded Assessors	Unclear risk	Not stated whether assessors were blinded.