Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Overall symptoms (other than loudness) of tinnitus
RCT Crossover design	21 people In review	Proportion of people with a significant improvement from baseline in intensity of tinnitus symptoms (assessed using tinnitus intensity rating [scale of 0–10]) 7/17 (41%) with tinnitus-masking device 5/17 (29%) with placebo	Significance not assessed Reported results were post-crossover; post-crossover results are difficult to interpret because of the possibility of a persistence of treatment effect after crossover Data were omitted for 4/21 (19%) people for inadequate use of the tinnitus rating scale