Table 5

Results of the primary cost-effectiveness analysis and sensitivity analyses

AnalysisIntervention, n (% total)Education as normal,n (% total)Difference in total costs (£) (intervention+total public service costs)Difference in effect (proportion of pupils reporting a heavy drinking episode in previous 30 days avoided)
Primary analysis at 33 months4189 (65.7)4037 (63.5)−17.19 (−402.84, 368.46)0.08 (0.06, 0.09)
Sensitivity analysis for primary cost-effectiveness analysis at 33 months
Multiple imputation for missing cost and outcome data6379 (100)6359 (100)34.10 (−299.44, 367.44)0.08 (0.07, 0.09)
Discounting costs and outcome at 1.5%4189 (65.7)4037 (63.5)−17.63 (−410.62, 375.36)0.07 (0.06, 0.09)
Adjustment of costs and outcome data for cluster only4189 (65.7)4037 (63.5)−49.23 (−419.52, 321.07)0.08 (0.06, 0.10)
5% increase in costs4189 (65.7)4037 (63.5)−18.05 (−422.98, 386.88)0.07 (0.06, 0.09)
5% decrease in costs4189 (65.7)4037 (63.5)−16.33 (−382.70, 350.04)0.07 (0.06, 0.09)
  • Total participants in the study=12 738 (intervention=6379, education as normal=6359).

  • n, number analysed .