Domain* | Cronbach's alpha 49 item SS-QoL | Item total domain correlations 49 item SS-QoL | Item selected for SS-QoL-12 | Response set† | Explained variance of domain by chosen item (%) |
Self-care | 0.85 | 0.77–0.85 | Did you need help taking a bath or shower? | 1 | 73 |
Mobility | 0.92 | 0.81–0.89 | Did you have to stop and rest more than you would like when walking or using a wheelchair? | 1 | 79 |
Upper extremity | 0.86 | 0.76–0.88 | Did you have trouble buttoning buttons?‡ | 1 | 78 |
Language | 0.90 | 0.80–0.89 | Did you have to repeat yourself so others could understand you? | 1 | 80 |
Vision | 0.80 | 0.84–0.87 | Did you have trouble seeing the television well enough to enjoy a show? | 1 | 75 |
Work | 0.92 | 0.91–0.93 | Did you have trouble doing daily work around the house? | 1 | 87 |
Thinking | 0.82 | 0.82–0.90 | I had trouble remembering things. | 2 | 81 |
Family roles | 0.82 | 0.78–0.89 | I felt I was a burden to my family.‡ | 2 | 80 |
Social roles | 0.87 | 0.72–0.87 | My physical condition interfered with my social life. | 2 | 75 |
Personality | 0.90 | 0.81–0.89 | My personality has changed. | 2 | 79 |
Mood | 0.85 | 0.71–0.85 | I was discouraged about my future. | 2 | 72 |
Energy | 0.92 | 0.90–0.95 | I was too tired to do what I wanted to do. | 2 | 90 |
↵* Physical HRQoL: self-care, mobility, upper extremity function, language, vision, work. Psychosocial HRQoL: thinking, family roles, social roles, personality, mood, energy.
↵† Response set 1: (1) couldn't do it at all; (2) a lot of trouble; (3) some trouble; (4) little trouble; (5) no trouble at all. Response set 2: (1) strongly agree; (2) moderately agree; (3) neither agree nor disagree; (4) moderately disagree; (5) strongly disagree.
↵‡ Item arbitrarily chosen from two that had equal highest item rest correlations.
SS-QoL, Stroke Specific Quality of Life Scale; SS-QoL-12, 12 item Stroke Specific Quality of Life Scale.