Fig. 1
Research planning chart including main features of the protocol study. 1 Total of 190 schools within Europe and meeting inclusion criteria; n = 60 schools already offering facilitated contact with candidate participants; 2 Estimated using a response rate of 20% and based on an invitation to participate to 200 students per school, on average, within 60 schools; 3 Estimated using a loss-to-follow-up of 20 and 25% at Phase 2 (6 months) and Phase 3 (12 months), respectively. MSK, musculoskeletal; PRMDs, playing-related musculoskeletal disorders