Table 4.

Retention rate across included intervention studies.

Study	Author (year)	Description	Retention at 6 months, %	Retention at 18 months, %	Retention at 24 months, %	Notes
1	Fazzino et al (2017) [17]	An RCTa assessing the effects of mobile health weight management on physical activity, weight loss, and weight maintenance	N/Ab	68	N/A	80% maintained intervention use at 18 months but without valid accelerometer data.
2	Chiang et al (2017) [18]	An RCT on the weight loss after repaired RYGBc surgery, with and without wearable devices	N/A	N/A	N/A	N/A
3	Jakicic et al (2016 [19]	An RCT comparing outcomes of technology-enhanced interventions with standard behavioral interventions	N/A	N/A	75	N/A
4	Jakicic et al (2012) [20]	An RCT comparing a standard and stepped-care intervention in weight loss	N/A	72	N/A	N/A
5	Sepah et al (2015) [21]	A diabetes prevention study measuring the outcomes of weight and hemoglobin A1c	79.1	N/A	70.1	N/A

^aRCT: randomized controlled trial.

^bN/A: not applicable.

^cRYGB: Roux-en-Y gastric bypass.