NoT MD 2009.
| Methods | Country: Maryland, USA Setting: 4 high schools (I = 2 and C = 2) Study design: RCT, with individuals randomized within schools, schools allocated in balanced blocks | |
| Participants | Participants: 194 students (I = 92; C = 102)
Age range: 14‐18 years, mean 15.9
Criteria for inclusion: self‐report of smoking AND expressed willingness to quit
Follow‐up method: self‐report & salivary cotinine verification Inducements to enter study: sessions conducted over lunch, which was provided plus "modest incentives" Verification of smoking status: none Pre‐study smoking status assessment: self‐reports, age first smoked and "nicotine dependence" Significant demographic differences between arms of the trial: slight imbalance in ethnicity, age, nicotine dependence and quit attempts Post‐study smoking status assessment: self‐report and salivary cotinine |
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| Interventions | Intervention: modified NoT intervention: 20 lunch time sessions of 25/30 min (compared to 5 x 50 min sessions of other NoT trials) Theoretical basis of intervention: SCT Control: brief Intervention of 1 session with pamphlets | |
| Outcomes | Measurement: 30‐day PPA Follow‐up periods: 6 months and 12 months Verification: self‐reporting verified by salivary cotinine Losses to follow‐up: at 6 months and at 12 months | |
| Notes | Clarification of data and details of incentives sought from study authors but not received Same study also evaluated an alternative intervention, see Joffe 2009 Modified NoT: entered as NoT since basis of intervention same but timescale of delivery modified Used most conservative data presented in paper (Table 4) |
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| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Random sequence generation (selection bias) | Unclear risk | see Joffe 2009 |
| Allocation concealment (selection bias) | Unclear risk | see Joffe 2009 |
| Blinding of participants and personnel (performance bias) All outcomes | Unclear risk | see Joffe 2009 |
| Blinding of outcome assessment (detection bias) All outcomes | Low risk | see Joffe 2009 |
| Incomplete outcome data (attrition bias) All outcomes | Low risk | see Joffe 2009 |