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| Study characteristics | ||
| Methods | NA | |
| Data | NA | |
| Comparisons | NA | |
| Outcomes | NA | |
| Terminology for active placebo | NA | |
| Scores and unpleasantness of the active placebo | NA | |
| Funding and conflicts of interest | NA | |
| Notes | Only used in a sensitivity analysis. | |
| Risk of bias | ||
| Item | Authors' judgement | Support for judgement |
| Free from risk of bias arising from the randomisation process | Unclear | No information. |
| Free from risk of bias in selection of the reported result All outcomes | Unclear | No information. |
