Czalbert 1990.
| Methods | RCT | |
| Participants | 34 IBS Hospital out clinic Mean age 49.3 years |
|
| Interventions | Spasmolytic peppermint oil 0.2 ml tds for 10 days | |
| Outcomes | Symptom score, dichotomous | |
| Notes | No run‐in | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Random sequence generation (selection bias) | Unclear risk | Not described |
| Allocation concealment (selection bias) | Unclear risk | Not described |
| Blinding of participants and personnel (performance bias) All outcomes | Unclear risk | Not described |
| Incomplete outcome data (attrition bias) All outcomes | Unclear risk | Not described |
| Selective reporting (reporting bias) | Unclear risk | Not described |
| Other bias | Unclear risk | Not described |