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Health Education Research Advance Access originally published online on June 25, 2007
Health Education Research 2008 23(2):228-237; doi:10.1093/her/cym020
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© Published by Oxford University Press [2007].

Food, Fun and Fitness Internet program for girls: influencing log-on rate

Debbe Thompson*, Tom Baranowski, Karen Cullen, Kathy Watson, Ashanti Canada, Riddhi Bhatt, Yan Liu and Issa Zakeri

Children's Nutrition Research Center, Baylor College of Medicine, 1100 Bates Street, Houston, TX 77030, USA

* Correspondence to: D. Thompson. E-mail: dit{at}bcm.tmc.edu

Internet-based interventions hold promise as an effective channel for reaching large numbers of youth. However, log-on rates, a measure of program dose, have been highly variable. Methods to enhance log-on rate are needed. Incentives may be an effective method. This paper reports the effect of reinforcement schedule and recruitment method on log-on rates to an 8-week Internet-based obesity prevention program. It also explores trends in log-on rate. Girls were randomized to receive immediate (weekly) or delayed (program end) incentives ($5). The study was powered to detect a moderate-to-large effect (0.65). Overall log-on rate was 74.5%. A higher but not statistically different log-on rate was observed in the immediate incentive group (79%) than in the delayed incentive group (70%) (P = 0.118), and among girls recruited via media (80%) as opposed to non-media methods (69%) (P = 0.058). Trend analysis indicated a significant drop in log-on rate between weeks 4 and 5 among all participants (P = 0.009). Although an acceptable log-on rate was achieved in this program, there was a substantial drop between weeks 4 and 5. Identifying the reason that this occurred may provide insight into how to further enhance log-on rate. Recruitment method may influence log-on rate.

Received on May 15, 2006; accepted on March 8, 2007


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