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 |