Recruitment and ascertainment
cough
Of approximately 200 CCGs in England in October 2018, 110 were assessed as being eligible (≥15 practices using EMIS); 52 consented to take part, and 47 provided at least one practice (CHICO trial Consolidated Standards of Reporting Trials flowchart. CCG=clinical commissioning group; EMIS=electronic health record system. *One practice randomised was made up of two practices that work closely and were due to merge. †Reasons include lack of staff, lack of resources, and lack of consultations for children with cough. ‡Two practices in control arm merged, so outcome data were compiled into one practice