Table 2.

Difference-in-difference analysis for autonomous motivation scores at 12 weeks compared with baseline.

Study groups	Baseline mean (SE)a	12-week mean (SE)	P value
			Within-group difference at 12 weeks)	Difference-in-difference from baseline to 12 weeks
Control (n=16)	6.01 (0.21)	5.87 (0.25)	–0.14 (.57)	Not applicable
App-only (n=17)	5.80 (0.21)	5.88 (0.25)	0.08 (.73)	0.22 (.51)
App-plus (n=22)	5.96 (0.21)	5.90 (0.21)	–0.06 (.72)	0.08 (.77)

^aAll values in this table are predicted from the model.