Table A1.

Results from linear mixed effects modeling of adherence rates as a function of methodology (app vs fitbit), sex, age, study arm (review vs no review), and time. Age was centered around 40 years and has unit decades. Time was scaled to be 0 at study start and 1 at study end. Binary variables were first encoded as Fitbit=1 and App=0 for Method, as Female=1 and Male=0 for Sex, and Review=1 and No review=0 for Arm; and then were centered around their mean.

						95% CI
Name	Estimate	SE	t	df	P	Lower	Upper
(Intercept)	72.1	3.4	21.3	3916	1.4E-95	65.5	78.8
Time	−12.1	3.3	−3.6	3916	3.0E-04	−18.6	−5.5
Method	1.1	0.9	1.2	3916	0.22	−0.7	3.0
Age	−2.1	3.2	−0.7	3916	0.51	−8.5	4.2
Sex	−1.3	6.8	−0.2	3916	0.85	−14.6	12.0
Arm	−4.3	6.8	−0.6	3916	0.53	−17.6	9.0
Time:Method	−12.0	3.2	−3.7	3916	2.1E-04	−18.4	−5.7
Time:Age	−2.9	3.2	−0.9	3916	0.36	−9.2	3.3
Method:Age	−0.3	0.9	−0.3	3916	0.77	−2.0	1.5
Time:Sex	−7.8	6.7	−1.2	3916	0.24	−20.9	5.3
Method:Sex	3.9	1.9	2.1	3916	0.04	0.2	7.5
Age:Sex	−4.5	6.4	−0.7	3916	0.48	−17.0	8.1
Time:Arm	−6.4	6.7	−1.0	3916	0.34	−19.5	6.7
Method:Arm	0.8	1.9	0.4	3916	0.66	−2.9	4.5
Age:Arm	−5.5	6.5	−0.8	3916	0.40	−18.2	7.2
Sex:Arm	11.4	13.6	0.8	3916	0.40	−15.2	38.0
Time:Method:Age	−7.3	3.1	−2.4	3916	0.02	−13.4	−1.3
Time:Method:Sex	−3.3	6.5	−0.5	3916	0.61	−16.0	9.4
Time:Age:Sex	−10.9	6.3	−1.7	3916	0.08	−23.3	1.5
Method:Age:Sex	−1.8	1.8	−1.0	3916	0.32	−5.2	1.7
Time:Method:Arm	−17.9	6.5	−2.8	3916	0.01	−30.6	−5.2
Time:Age:Arm	−1.1	6.4	−0.2	3916	0.86	−13.6	11.4
Method:Age:Arm	14.9	1.8	8.3	3916	1.0E-16	11.4	18.4
Time:Sex:Arm	−10.3	13.4	−0.8	3916	0.44	−36.6	15.9
Method:Sex:Arm	−6.2	3.7	−1.7	3916	0.10	−13.6	1.1
Age:Sex:Arm	−34.1	12.8	−2.7	3916	0.01	−59.2	−9.0
Time:Method:Age:Sex	−6.5	6.1	−1.1	3916	0.29	−18.5	5.5
Time:Method:Age:Arm	−5.0	6.2	−0.8	3916	0.42	−17.1	7.1
Time:Method:Sex:Arm	5.0	13.0	0.4	3916	0.70	−20.4	30.5
Time:Age:Sex:Arm	−24.3	12.6	−1.9	3916	0.05	−49.1	0.5
Method:Age:Sex:Arm	23.5	3.5	6.6	3916	3.3E-11	16.6	30.5
Time:Method:Age:Sex:Arm	−3.5	12.2	−0.3	3916	0.77	−27.6	20.5