Does the design of the NHS Low‐Calorie Diet Programme have fidelity to the programme specification? A documentary review of service parameters and behaviour change content in a type 2 diabetes intervention
Authors' conclusion
A loss of fidelity for some service parameters and BCTs was identified across the provider's designs; this may have important consequences for programme delivery and thus programme outcomes. Furthermore, there was a large degree of variation between providers in the presence and dosage of additional BCTs. How these findings relate to the fidelity of programme delivery and variation in programme outcomes and experiences across providers will be examined.
Study context
- Population
- Four independent service providers piloting NHS low-calorie diet programmes for T2D across 10 localities
- Participants
- 4 service providers
- Comparison
- Programme designs of four service providers vs NHS England service specification
- Outcome
- Fidelity of programme designs to the NHS England service specification (service parameters and BCTs)
Methodological detailsdouble-coded, TIDieR framework, Behaviour Change Technique (BCT) Taxonomy
- Double-coded
- TIDieR framework
- BCT Taxonomy
Main finding
As reported in the abstract
Proportion of the 23 specification BCTs included by providers
74%–87%
Specification BCTs included by all four providers
12
Specification BCTs consistently absent
2
Additional BCTs included across providers
7–24
Original publication
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