| Methods |
Design: three group parallel trial
Purpose: examine the effect of hypnosis on smoking cessation |
| Participants |
Patients: smokers that had attended one smoking program before
Baseline comparability: NS |
| Interventions |
Placebo: one session in which the reason for smoking and attempts to stop were discussed
Untreated: no session
Experimental: single hypnosis session
(Co‐intervention: NS) |
| Outcomes |
Number of abstinent smokers
Mean number of cigarettes smoked per week |
| Notes |
All 20 patients in the placebo and 20 patients in the no‐treatment group smoked at post intervention. Data extracted as if one patient in each group did not smoke. This was done due to overcome software incapacity in computing data with no successes. |
| Risk of bias |
| Bias |
Authors' judgement |
Support for judgement |
| Blinding?
Treatment provider |
High risk |
Not described as double‐blind (placebo/hypnosis) |
| Incomplete outcome data addressed?
All outcomes |
Low risk |
Drop‐out < 15% |
| Free of selective reporting? |
Unclear risk |
No protocol available |
| Free of other bias? |
Low risk |
|
| No signs of variance inequality or skewness? |
Unclear risk |
Not relevant (binary outcome) |
| Trial size > 49? |
High risk |
N = 40 |
| Clearly concealed allocation + trial size > 49 + drop‐out max 15% |
High risk |
Trial size < 49 |
