Schedule of baseline and follow-up measures
| Screening and baseline | Month 3 | Month 9 | Month 15* | |
| Demographics (eg, age, gender, education attained, employment status) | X | |||
| Self-reported cigarettes per day (or equivalent) | X | X | X | X |
| Reduction of ≥50% in number of cigarettes smoked since baseline† | X | X | ||
| Biochemically confirmed abstinence (self-reported quitters only) | X | X | X | |
| Self-reported floating prolonged abstinence (since quitting smoking, with quit date, if relevant) over at least 6 months† | X | X | ||
| Accelerometer assessed minutes of moderate and vigorous physical activity in a subsample | X | |||
| Self-reported 7-day recall of physical activity | X | X | X | |
| Heaviness of Smoking Index | X | |||
| Use of smoking management products | X | X | X | X |
| Urge and strength of urge to smoke | X | X | ||
| Engagement with the health trainer intervention (8 weeks, plus optional 6 weeks additional support if a quit attempt is made) | X | |||
| Health and social care utilisation | X | X | X | |
| Health-related quality of life (EQ-5D-5L and SF-12) | X | X | X | |
| Self-reported weight and height (to calculate BMI) | X | X | X | |
| Self-reported process measures | X | X | ||
| Importance and confidence in smoking reduction and cessation | ||||
| Importance and confidence in being physically active | ||||
| Action planning to change smoking | ||||
| Action planning to change physical activity | ||||
| Self-monitoring of smoking | ||||
| Self-monitoring of physical activity | ||||
| Availability of support to reduce smoking | ||||
| Availability of support to increase physical activity | ||||
| Use of physical activity for smoking regulation | ||||
| Serious adverse events (self-reported) | X | X | ||
| Qualitative process evaluation (in parallel throughout) (sample) | X | X | X | X |
*Only participants with biochemically verified abstinence at 9 months are followed-up at 15 months post-baseline.
†Derived measure.
BMI, body mass index; EQ-5D-5L, EuroQol-5 dimension-5 level ; SF-12, 12-Item Short Form Health Survey.