Hazell 1985.

Methods	Randomised controlled trial
Participants	153 patients
Interventions	Allocation randomly to counselling or one of 2 types of masker, if the patient had no deafness, or to a hearing aid, masking device or combination instrument if the patient had hearing problems
Outcomes	Crown Crisp Experiential Index (a measure of psychoneurotic pathology), audiometry, tinnitus loudness levels and thresholds. In addition a Semantic Differential Score is calculated which is a means of subjectively scoring various features of tinnitus on a 1 to 7 scale
Notes	—
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	B