Characteristics of included studies: methods
| Trial (year published) | Method of randomisation | Allocation concealment | Blinding of intervention | Complete follow up | Blinding of outcome measurement |
|---|---|---|---|---|---|
| Gross (1983)12 | Random number table | Yes | No | Yes | Can’t tell |
| Lucas (1990)3 | Sealed envelopes | Yes | No | Yes | Can’t tell |
| Svenningsen (1982)10 | Not stated | Can’t tell | No | Yes | Can’t tell |
| Tyson (1983)11 | Sealed envelopes | Yes | No | Yes | Can’t tell |