Table 5.

Incremental costs of the Promoting Alternative Thinking Strategies (PATHS) intervention in sensitivity analyses: (1) 10-year intervention life, (2) inclusion of teacher’s salary costs

Scenario	Total costs (£, year 2018/19 values)
(1) 10-year intervention life
Materials
Annuitised over 5-year intervention life	17,007
Annuitised over 10-year intervention life	9233
PATHS coach training
Annuitised over 5-year intervention life	4022
Annuitised over 10-year intervention life	2184
Other intervention costs	66,844
Total intervention costs—10-year intervention life	78,260
Cost per child—10-year intervention life	28.51
(2) Including teacher’s salary costs
Non-recurrent costs
Original classroom teacher time during initial full-day training	21,570
Recurrent costs
Original classroom teacher time during follow-up half-day training	17,162
Replacement classroom teacher time during initial full-day training	4685
Replacement classroom teacher time during follow-up half-day training	3727
Classroom teacher time during lesson delivery	255,228
Classroom teacher time during lesson preperation
40 min/week lesson preparation	170,152
45 min/week lesson preparation	191,142
Total cost of teacher’s time
40 min/week lesson preparation	472,523
45 min/week lesson preparation	493,792
Other intervention costs	87,873
Total intervention costs
40 min/week lesson preparation	560,396
45 min/week lesson preparation	581,665
Cost per child
40 min/week lesson preparation	204.15
45 min/week lesson preparation	211.90
(3) Roll-out scenario
Costs for a single-form entry, seven year group, school
Non-recurrent costs
Materialsa	1023
PATHS coach training and initial supporta	1916
Initial full-day training for original classroom teachersa	244
Total non-recurrent costs	3183
Recurrent costs
Half-day follow-up training	275
Initial full-day training for replacement teachersb	244
Total recurrent costs	519
Total cost for single-form entry, seven year group, school	3701
Price per class	528.71
Total intervention cost for PATHS sample (99 classes)	52,343
Cost per child	19.07

PATHS Promoting Alternative Thinking Strategies

All costs discounted a 3.5%/year, and inflated to 2018/19 prices using the retail price index where appropriate

^aUsing the national wastage rate of 10.6%, the expected length of service for a teacher is 9.43 years. As this is less than the 5-year expected life of the intervention, all non-recurrent costs are annuitised over a 5-year intervention life at 3.5% per year

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