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Table 5 Internal consistency and reliability of the SAQ-CAN and original SAQ

From: Psychometric evaluation of a Canadian version of the Seattle Angina Questionnaire (SAQ-CAN)

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