Alberta Diabetes and Physical Activity Trial (ADAPT): A randomized theory-based efficacy trial for adults with type 2 diabetes - rationale, design, recruitment, evaluation, and dissemination

Table 1 ADAPT psychosocial questionnaire reliability summary (N = 287)

Construct (theory)	Number of items	Cronbach's α at baseline	References
Planning/Implementation (SCT)	7	.88	[16]
Intention (SCT)	4	.79	[16]
Outcome expectations (SCT)	8	.90	[16]
Pros (SOC)	5	.81	[35]
Cons (SOC)	3	.72	[35]
Attitude (TPB)	6	.86	[15]
Subjective Norm (TPB)	4	.73	[15]
Perceived behavioural control (TPB)	2	.56*	[15]
Response Efficacy (PMT)	3	.84	[18]
Severity (PMT)	1	NA	[18]
Vulnerability (PMT)	1	NA	[18]
Self-Efficacy (TPB/PMT/SCT/SOC)	12	.94	[16, 18, 35]

Note: PMT = protection motivation theory; TPB = theory of planned behaviour; SCT = social cognitive theory; SOC = stages of change
*Pearson correlation

ISSN: 1745-6215