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Table 2 Intervention fidelity plan: The GLOW trial

From: Gestational weight gain and optimal wellness (GLOW): rationale and methods for a randomized controlled trial of a lifestyle intervention among pregnant women with overweight or obesity

BCC fidelity domain Fidelity strategies implemented in GLOW
Intervention design ▪ Standardize intervention dose (e.g., number and duration of sessions)
▪ Standardize interventionist credentials (registered dietician)
▪ Specify theoretical model (Behavior change techniques based on social cognitive theory and motivational interviewing)
Interventionist training ▪ Standardize training (e.g., training includes formal skill-building curriculum in motivational interviewing)
▪ Assess and monitor skill maintenance over time via weekly supervision, periodic re-certification and    retraining, and provision of feedback
Intervention delivery ▪ Use an intervention protocol
▪ Document intervention delivery (e.g., number, duration, and content of sessions delivered) using an electronic tracking system and written checklists; review regularly
▪ Audiotape all sessions; code 10% of selected core sessions for key behavior change techniques, using a checklist adapted from the Behavior Change Technique Taxonomy v1 [25]
▪ Conduct periodic live observations
Intervention receipt and enactment by participants ▪ Summarize intervention content and skills at each session
▪ Document participants’ performance of intervention skills (e.g., frequency of self-monitoring) using an electronic tracking system; review regularly and provide feedback, both to participants and interventionists
  1. BCC: National Institutes of Health Behavior Change Consortium [30, 31].