Table 3.

Internal Consistency: Cronbach's Alpha Coefficients

	SELF-DIRECTED INTERVENTION		COACH-LED INTERVENTION
CONSTRUCT	3 MONTHS (N=57)	15 MONTHS (N=56)	3 MONTHS (N=56)	15 MONTHS (N=60)
Perceived usefulness	0.95	0.97	0.96	0.96
Perceived ease of use	0.94	0.91	0.94	0.96
Affect	0.86	0.87	0.82	0.84
Social influence	0.94	0.99	0.96	0.97
Compatibility	0.78	0.74	0.79	0.80
Self-efficacy	0.90	0.94	0.93	0.91
Concern	0.86	0.90	0.91	0.90
Intention to use	0.94	0.95	0.95	0.97