Abstract
Purpose.
To address the translational research question regarding the optimal intervention “dose” to produce the most cost-effective rate of weight loss, we conducted the Drop It At Last (DIAL) study.
Design.
DIAL is a 6-month pilot randomized trial to examine the efficacy of phone-based weight loss programs with varying levels of treatment contact (10 vs. 20 sessions) in comparison to self-directed treatment.
Setting.
Participants were recruited from the community via mailings and advertisement.
Subjects.
Participants were 63 adults with a body mass index between 30 and 39 kg/m2.
Intervention.
Participants received a standard set of print materials and were randomized to either: (1) self-directed treatment; (2) 10 phone coaching sessions; or (3) 20 phone coaching sessions.
Measures.
Measured height, weight, and psychosocial and weight-related self-monitoring measures were collected at baseline and follow-up.
Analysis.
General linear models were used to examine 6-month treatment group differences in weight loss and in psychosocial and behavioral measures.
Results.
Weight losses were – 2.3, – 3.2, and – 4.9 kg in the self-directed, 10-session, and 20-session groups, respectively (p < .21). Participants who completed 10 or more sessions lost more weight (– 5.1 kg) compared to those completed four or fewer sessions (– .3 kg, p < .04).
Conclusion.
Phone-based weight loss program participation is associated with modest weight loss. The optimal dose and timing of intervention warrant further study.
Keywords
Get full access to this article
View all access options for this article.