| Year | Randomization method | Blind | Explanation for withdrawals/drop outs | Jadad score | Allocation concealment | Intention-to-treat analysis |
---|---|---|---|---|---|---|---|
Ali et al. [16] | 2007 | Computer-generated random numbers | Single blind | Yes | 3 | Sealed envelopes | Yes |
Hoole et al. [17] | 2009 | Computer-generated random numbers | Single blind | Yes | 3 | Sealed envelopes | No |
Walsh et al. [18] | 2009 | Computer-generated random numbers | Unclear | Yes | 3 | Sealed envelopes | Yes |
Walsh et al. [19] | 2010 | Computer-generated random numbers | Unclear | Yes | 3 | Sealed envelopes | Yes |
Rahman et al. [20] | 2010 | Computer-generated random numbers | Double blind | Yes | 5 | Sealed envelopes | Yes |
Choi et al. [21] | 2010 | Computer-generated randomization table | Unclear | Yes | 3 | Unclear | Yes |
Thielmann et al. [22] | 2010 | Unclear | Single blind | Yes | 2 | Unclear | Yes |
Zimmerman et al. [23] | 2011 | A block randomization generated by the study coordinator | Single blind | Yes | 2 | Sealed envelopes | Yes |
Lucchinette et al. [24] | 2012 | Computer-generated random numbers | Unclear | Yes | 3 | Sealed envelopes | Yes |
Young et al. [25] | 2012 | A block randomization using online randomization sequence generator | Double blind | Yes | 5 | Sealed envelopes | Yes |