Table 3.

Incremental costs of the Promoting Alternative Thinking Strategies (PATHS) intervention

Costs	Total costs (£, 2018/19 values)
Non-recurrent costs
Materialsa	17,007
PATHS coach traininga	4002
Initial full-day teacher training for original teachersb	18,294
Total non-recurrent costs	39,323
Recurrent costs
Ongoing support	25,916
Follow-up half-day teacher training for original teachers	12,501
Training replacements for year 4 and 5 teachers leaving at the end of the school year (trained with year 6 teachers in year 2)
Initial full-day trainingc	1664
Follow-up half-day training	1302
Training replacements for teachers leaving mid-school year
Initial full-day trainingc	4278
Follow-up half-day training	2889
Total recurrent costs	48,550
Total intervention costs (all schools)	87,873
Cost per child	32.01

All costs discounted at 3.5% per year and inflated to 2018/19 values using the retail price index

^aAnnuitized over 5-year expected intervention life at 3.5% per year

^bAnnuitized over the 2.75-year within-trial expected length of teacher service (given 36.36% teacher turnover rate) at 3.5% per year

^cAlthough recurrent, this training is still annuitized as it will have an effect beyond the trial period