Table 1.

Findings for the relationship between user engagement and the cardiovascular disease health behavior change or health outcome.

Outcome	Studies with positive finding, n (%)	Studies with negative finding, n (%)
Weight (n=13)	9 (69)	4 (31)
BMI (n=4)	3 (75)	1 (25)
Percent body fat (n=2)	1 (50)	1 (50)
Waist circumference (n=3)	2 (67)	1 (33)
Objectively measured physical activity (n=5)	3 (60)	2 (40)
Self-reported physical activity (n=3)	1 (33)	2 (67)
Self-reported diet (n=2)	0 (0)	2 (100)
Hemoglobin A1ca (n=5)	3 (60)	2 (40)
Systolic blood pressure (n=2)	0 (0)	2 (100)
Diastolic blood pressure (n=2)	0 (0)	2 (100)
Total cholesterol (n=3)	0 (0)	3 (100)
HDLb cholesterol (n=1)	0 (0)	1 (100)
Triglycerides (n=3)	0 (0)	3 (100)
Resting heart rate (n=1)	0 (0)	1 (100)
Blood carotenoids (n=1)	0 (0)	1 (100)
Serum glucose (n=1)	0 (0)	1 (100)
Insulin levels (n=1)	0 (0)	1 (100)
METmax (n=1)	0 (0)	1 (100)

^aHbA_1c: hemoglobin A_1c.

^bHDL: high-density lipoprotein.