| Author, Year | Outcome Measure(s) | Results | Quality of RCT | 
| Papeix et al. 2015 | MSIS-29 | Not Significant | Fair | 
| Rietberg et al. 2014 | IPA, MSIS-29 | Not Significant | Good | 
| Khan et al. 2008 | MSIS-29 | Not Significant | Good | 
| Kos et al. 2007 | IPA | Not Significant | Good | 
| Craig et al. 2003 | HAP | Positive | Fair | 
| Freeman et al. 1997 | LHS | Positive | Fair |