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. 2019 Mar;10(1):95-102.
doi: 10.1016/j.shaw.2018.08.002. Epub 2018 Aug 21.

Process Evaluation of a Mobile Weight Loss Intervention for Truck Drivers

Brad Wipfli  1   2 , Ginger Hanson  3 , Kent Anger  2   1 , Diane L Elliot  4 , Todd Bodner  5 , Victor Stevens  6 , Ryan Olson  2   1   5
Affiliations

Process Evaluation of a Mobile Weight Loss Intervention for Truck Drivers

Brad Wipfli et al. Saf Health Work. 2019 Mar.

Abstract

Background: In a cluster-randomized trial, the Safety and Health Involvement For Truck drivers intervention produced statistically significant and medically meaningful weight loss at 6 months (-3.31 kg between-group difference). The current manuscript evaluates the relative impact of intervention components on study outcomes among participants in the intervention condition who reported for a postintervention health assessment (n = 134) to encourage the adoption of effective tactics and inform future replications, tailoring, and enhancements.

Methods: The Safety and Health Involvement For Truck drivers intervention was implemented in a Web-based computer and smartphone-accessible format and included a group weight loss competition and body weight and behavioral self-monitoring with feedback, computer-based training, and motivational interviewing. Indices were calculated to reflect engagement patterns for these components, and generalized linear models quantified predictive relationships between participation in intervention components and outcomes.

Results: Participants who completed the full program-defined dose of the intervention had significantly greater weight loss than those who did not. Behavioral self-monitoring, computer-based training, and health coaching were significant predictors of dietary changes, whereas behavioral and body weight self-monitoring was the only significant predictor of changes in physical activity. Behavioral and body weight self-monitoring was the strongest predictor of weight loss.

Conclusion: Web-based self-monitoring of body weight and health behaviors was a particularly impactful tactic in our mobile health intervention. Findings advance the science of behavior change in mobile health intervention delivery and inform the development of health programs for dispersed populations.

Keywords: Intervention process evaluation; Mobile health; Occupational health; Weight loss.

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Figures

Fig. 1
Fig. 1
Training units completed by intervention participants.
Fig. 2
Fig. 2
Motivational interviewing calls completed by participants.
Fig. 3
Fig. 3
Body weight and behavior self-monitoring logs submitted by intervention participants.
Fig. 4
Fig. 4
Timing of trainings completion by intervention participants.
See this image and copyright information in PMC

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