Feasibility success criteria have been defined a priori for the intervention and study design. There are six feasibility criteria related to the intervention, covering aspects of the timing of the intervention, compliance, and evaluation. There are also six feasibility criteria related to the study design, covering recruitment rate; participation rate; acceptability of procedures; attrition rate; and the time-scale of data collection.
Dependent on the number of criteria successfully met, the following classification will be used:
"*" 0-2/6 criteria met - Stop; intervention and/or study design not feasible. "*" 3-4/6 criteria met - Continue with modifications; feasible intervention and/or study design with modifications.
"*" 5/6 criteria met - Continue without modifications, but monitor closely; feasible intervention and/or study design with close monitoring.
"*" 6/6 criteria met - Continue without modifications; feasible intervention and/or study design as is.