| Study | Reason for exclusion |
|---|---|
| Al‐Jassim 1987 | ALLOCATION: Non‐randomised |
| Al‐Jassim 1988 | ALLOCATION: Non‐randomised |
| Attias 1993 | ALLOCATION: Non‐randomised |
| Caffier 2006 | ALLOCATION: Non‐randomised |
| Coles 1984 | ALLOCATION: Non‐randomised |
| Delb 2002 | ALLOCATION: Non‐randomised |
| Erlandsson 1987 | ALLOCATION: Non‐randomised |
| Eysel‐Gosepath 2004 | ALLOCATION:
Randomised controlled trial PARTICIPANTS: Adults with persistent, distressing, subjective tinnitus of any aetiology INTERVENTION: Treatment did not utilise masking techniques but TRT |
| Feldman 1971 | ALLOCATION: Non‐randomised |
| Feldman 1981 | ALLOCATION: Non‐randomised |
| Franz 2003 | ALLOCATION: Non‐randomised |
| Goldstein 2005 | This study evaluates the use of UltraQuiet ‐ a new form of high‐frequency bone conduction therapy. As such it is not a noise‐generating device per se and so has been excluded from this review |
| Hazell 1981 | ALLOCATION: Non‐randomised |
| Jakes 1987 | ALLOCATION: Non‐randomised |
| Jastreboff 1994 | ALLOCATION: Non‐randomised |
| Kiessling 1980 | ALLOCATION: No mention made of randomisation |
| Kitajima 1987 | ALLOCATION: Non‐randomised |
| Ohkwara 1995 | ALLOCATION: Non‐randomised |
| Pritchard 1987 | Abstract of meeting presentation ‐ no further data available |
| Vernon 1978 | ALLOCATION: Non‐randomised |
| Watanabe 1997 | ALLOCATION: Cohort study, non‐randomised |
TRT = tinnitus retraining therapy