marginally significantP=0.06
Team based programmes were associated with a marginally significant decrease in abstinence at 12 months of 4.3 points relative to individual programmes (95% confidence interval −8.8 to 0.2, P=0.06), and $40 bonus programmes increased abstinence by 8.5 points relative to no bonus programmes (2.8 to 14.1, P=0.003).