A theory-based process evaluation alongside a randomised controlled trial of printed educational messages to increase primary care physicians’ prescription of thiazide diuretics for hypertension [ISRCTN72772651]

Table 5 Results of analysis of covariance for secondary outcomes (change in attitude, subjective norm, and perceived behavioural control) (N = 426)

TPB construct	Effects	F	p	B	SE	95 % CI
TPB construct	Effects	F	p	B	SE	Lower	Upper
Attitude	Covariate
	Baseline attitude	184.72	<0.01	0.61	0.04	0.53	0.69
	Main effects
	Insert PEM	0.82	0.37	0.08	0.09	−0.09	0.25
	Outsert PEM (athoretical)	0.06	0.82	0.03	0.11	−0.19	0.24
	Outsert PEM (TPB)	0.03	0.86	−0.02	0.11	−0.23	0.20
Subjective norm	Covariate
	Baseline subjective norm	80.10	<0.01	0.57	0.04	0.49	0.65
	Main effects
	Insert PEM	3.69	0.06	0.17	0.09	−0.004	0.34
	Outsert PEM (athoretical)	1.45	0.23	0.13	0.11	−0.08	0.34
	Outsert PEM (TPB)	0.86	0.35	0.10	0.11	−0.11	0.32
Perceived behavioural control (PBC)	Covariate
	Baseline PBC	127.08	<0.01	0.49	0.04	0.40	0.57
	Main effects
	Insert PEM	1.20	0.27	0.10	0.09	−0.08	0.27
	Outsert PEM (athoretical)	0.11	0.74	0.04	0.11	−0.17	0.25
	Outsert PEM (TPB)	0.37	0.55	0.07	0.11	−0.15	0.28

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