Table 2

Construct validity and sensitivity to change

Awareness section	Construct validity				Sensitivity to change
	Control (sample 1, N=73)	Experts (sample 3, N=35)	t Test		Control (sample 2, N=43)	Intervention (sample 2, N=40)	t Test
	Mean (SD)	Mean (SD)	t (106)	p Value	Mean (SD)	Mean (SD)	t (81)	p Value
Symptoms (recall)	2.41 (1.30)	6.34 (1.32)	14.61	<0.001	1.55 (1.50)	3.85 (2.08)	5.78	<0.001
Symptoms (recognition)	8.78 (2.81)	13.48 (1.42)	9.32	<0.001	8.65 (3.46)	11.67 (2.66)	4.43	<0.001
Risk factors (recall)	2.21 (1.19)	3.45 (1.17)	5.14	<0.001	1.60 (1.09)	2.50 (1.41)	3.24	0.01
Risk factors (recognition)	35.60 (3.42)	38.94 (2.89)	4.98	<0.001	36.50 (4.63)	39.00 (5.81)	2.12	0.04

	N (%)	N (%)	χ²	p Value	N (%)	N (%)	χ²	p Value
Age at risk^*	11 (31.43)	24 (68.57)	13.22	0.01	6 (13.95)	10 (25.00)	1.63	0.20
Lifetime risk men^*	3 (4.11)	4 (11.43)	0.15	0.21	1 (2.33)	4 (10.00)	2.16	0.14
Lifetime risk women^*	13 (17.81)	7 (20.00)	0.78	0.79	4 (9.30)	7 (17.50)	1.21	0.27

	Mean (SD)	Mean (SD)	t (106)	p Value	Mean (SD)	Mean (SD)	t (81)	p Value
Total knowledge^†	44.92 (5.08)	53.42 (3.83)	8.78	<0.001	45.46 (6.66)	51.20 (7.60)	3.66	<0.001

↵* Shows those responding ‘correctly’ (ie, ‘a 70-year-old’, 7 or 8 out of 100 men, 4 or 5 out of 100 women).
↵† Total knowledge = warning signs + risk factors + age at risk + lifetime risk men + lifetime risk women.