Behavioural intervention showed no clear difference in postoperative morbidity: Any complication ‐ Brief intervention compared with control (moderate certainty).
Behavioural intervention leads to higher smoking cessation at time of surgery ‐ Brief behavioural intervention compared with control (high certainty).
Behavioural weight management interventions showed no clear difference in mean weight change (kg) at end of treatment ‐ Weight management… compared with brief advice or no intervention (low certainty).
Behavioural weight management interventions may leads to lower smoking cessation at 12 months ‐ Personalised weight management… compared with brief advice or no intervention (low certainty).
Behavioural weight management interventions showed no clear difference in smoking cessation at 6 months ‐ Weight management education versus… compared with brief advice or no intervention (low certainty).