Table 5.

Internal consistency and reliability of the SAQ-CAN and original SAQ

Instrument/scale	items	Items mean (SD)	Item-total correlation range	n	Cronbach’s alpha	Intra-class correlation coefficient (ICC)	Test retest ICC
SAQ-CAN
Indoor physical functioning	3	14.27 (1.65)	0.56–0.67	4052	0.77	0.76	0.56
Outdoor physical functioning	4	14.29 (6.54)	0.70–0.86	4052	0.90	0.90	0.54
Angina symptoms burden	6	24.10 (5.50)	0.46–0.72	4052	0.82	0.72	0.48
Treatment experience	3	12.95 (2.48)	0.74–0.84	4052	0.89	0.89	0.64
Original SAQ
Physical limitations	9	36.42 (9.34)	0.40–0.80	4052	0.89	0.86	0.59
Angina stability	1	3.84 (1.19)	-	4052	–	–	0.37
Angina frequency	2	9.90 (2.32)	0.49	4052	0.63	0.53	0.47
Treatment satisfaction	4	17.99 (2.77)	0.19–0.77	4052	0.77	0.72	0.62
Disease perception	3	10.37 (3.03)	0.50–0.67	4052	0.76	0.72	0.48

SAQ-CAN Seattle Angina Questionnaire Canadian version, SAQ Seattle Angina Questionnaire