Study | Reason for exclusion |
Atlay 1978 | Cross-over design. No data reported for the first stage of the study |
Briggs 1972 | Cross-over design. No usable data. |
Brunclik 1988 | High post-randomisation exclusion rates (20%). Half of the exclusions were for reasons of non-compliance |
Carne 1964 | Cross-over design. No data reported for the first stage of the study |
Hey 1978 | Study focusing on gastric sphincter pressure. No data reported for review outcomes |
Kovacs 1990 | No usable data on review outcomes. |
Lang 1989 | High post-randomisation attrition rates (38% lost to follow up by 2 weeks) |
Larson 1997 | Cross-over design. No data for the first stage of the study. |
Ranchet 1990 | Not clear whether this was a RCT. No information on how randomisation was achieved and intervention and control group sizes were very different |
Shaw 1978 | High attrition rates (24%). Symptoms were only assessed up to 60 minutes after treatment |
RCT: randomised controlled trial