BACKGROUND
Behavioral change interventions using smartphone applications (apps) have rapidly increased worldwide to prevent non-communicable diseases. However, most previous studies on the use and effectiveness of apps have been conducted in OECD countries, and rarely in developing countries.
OBJECTIVE
The purpose of this study was to compare the characteristics of long-term use of an app and examine the effects of app use on body weight changes over time between developing and OECD countries.
METHODS
Secondary data analysis was conducted with the repeated measures. Data were collected from users (n=312) in developing countries and users (n=8041) in OECD countries who used the app for 12-month. The app provided programs for self-monitoring of physical activity, dietary intake, and body weight. Descriptive statistics, independent T-tests, Chi-square tests and linear mixed models were used for analysis.
RESULTS
Body weight of overall users significantly decreased over time (-1.79kg, P <.001), however, there was no statistically significant difference in the change of body weight for 12-month between developing and OECD countries (β= -.16, P=.189). The changes in body weight over time (from baseline to 12 months) differed by gender (β= -19.01, P <.001). In addition, users who frequently monitored their lunch (β= -0.1, P <.001), dinner (β= -0.1, P <.001), body weight (β= -0.1, P <.001), evening snack (β= -0.1, P <.001), and exercise (β= -0.03, P <.001) showed significant weight loss over time.
CONCLUSIONS
This study found that smartphone app could be effective tools for self-monitoring of health-related behaviors and achieving weight loss regardless of the level of development of the user’s country of residence.