Fidelity components | |
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Content | Defined as an attempt to establish the ‘active ingredients’ of the intervention |
Coverage | Refers to the degree to which all persons who met study inclusion criteria received the intervention |
Frequency | Refers to whether the intervention was delivered with the regularity or frequency planned by its designers |
Duration | Establishes whether the intervention was delivered with the duration planned by its designers |
Moderating factors | |
Comprehensiveness of intervention description | Factors such as the degree of intervention complexity and whether the intervention description is complete or incomplete, vague or clear, may influence the degree of intervention fidelity |
Strategies to facilitate implementation | Several support strategies may be used to optimise and to standardise  intervention fidelity |
Quality of delivery | Concerns whether an intervention is delivered in a way that increases the likelihood of achieving the desired health outcomes |
Participant responsiveness | Refers to whether researchers established strategies to increase acceptance by and acceptability to those receiving an intervention |
Recruitmenta | Refers to procedures used to attract potential programme participants |
Contexta | Refers to surrounding social systems, such as structures and cultures of organisations and groups, and historical and concurrent activities and events, that may influence study activities |