Table 1.

Recruitment costs (in Euros) and CPP ^a for the mass media approach and HCA, the Netherlands, 2016–2018 (N=106)

Recruitment costs	MMA (n=39)*	HCA (n=67)*
Dissemination of letters to primary schools	372.58	NA
Website primary schools	4055.32	NA
Social media	3389.67	NA
National smoking cessation website	205.70	NA
Development of materials	NA	4286.43
Dissemination of materials	NA	1045.57
Promotion costs conferences	NA	1242.88
Social media	NA	99.71
Total costs	8023.27	6674.59
CPP	205.72	99.62

CPP: cost per participant. HCA: healthcare approach. MMA: mass media approach. NA: not applicable.

^aThe CPP is based on the total recruitment costs divided by the number of parents who participated in SFP (i.e. sum of parents who were randomized in the RCT and parents who received telephone counselling outside the RCT).

^*Number of parents.