| Study | Reason for exclusion |
|---|---|
| Allegro 2010 | Not (quasi‐)RCT |
| Bakhshaee 2007 | Not (quasi‐)RCT |
| Diller 2001 | Not (quasi‐)RCT |
| Doble 2006 | Not (quasi‐)RCT |
| Dornan 2007 | Not (quasi‐)RCT; control group not hearing impaired |
| Dornan 2009 | Not (quasi‐)RCT |
| Dornan 2010 | Not (quasi‐)RCT |
| Fairgray 2008 | Not (quasi‐)RCT |
| Fairgray 2010 | Not (quasi‐)RCT; treatment duration less than six months |
| Fulcher 2012 | Not (quasi‐)RCT |
| Hogan 2008 | Not (quasi‐)RCT |
| Hogan 2010 | Not (quasi‐)RCT |
| Sahli 2011 | Not (quasi‐)RCT |
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