Table 2. Percentage variance explained by each domain.
| Original domain and items | Raw score, mean (SD) | T-score, mean (SD) | Cronbach’s α coefficient | Item-rest correlation |
|---|---|---|---|---|
| Physical function | 17.9 (3.1) | 49.5 (7.7) | 0.89 | |
| Are you able to do chores such as vacuuming or yard work? | 0.72 | |||
| Are you able to go up and down the stairs at a normal pace? | 0.71 | |||
| Are you able to go for a walk of at least 15 min? | 0.81 | |||
| Are you able to run errands and shop? | 0.77 | |||
| Anxiety | 6.6 (3.5) | 49.3 (9.9) | 0.91 | |
| In the past 7 days, I felt fearful | 0.77 | |||
| In the past 7 days, I found it hard to focus on anything other than my anxiety | 0.85 | |||
| In the past 7 days, my worries overwhelmed me | 0.82 | |||
| In the past 7 days, I felt uneasy | 0.78 | |||
| Depression | 6.8 (3.8) | 50.2 (9.5) | 0.93 | |
| In the past 7 days, I felt worthless | 0.83 | |||
| In the past 7 days, I felt helpless | 0.85 | |||
| In the past 7 days, I felt depressed | 0.83 | |||
| In the past 7 days, I felt hopeless | 0.83 | |||
| Fatigue | 8.0 (4.0) | 46.5 (10.4) | 0.94 | |
| During the past 7 days, I felt fatigued | 0.80 | |||
| During the past 7 days, I had trouble starting things because I felt tired | 0.86 | |||
| During the past 7 days, how run-down did you feel on average? | 0.87 | |||
| During the past 7 days, how fatigued were you on average? | 0.89 | |||
| Sleep disturbance | 10.6 (3.6) | 51.0 (8.4) | 0.77 | |
| In the past 7 days, my sleep quality was | 0.64 | |||
| In the past 7 days, my sleep was refreshing | 0.46 | |||
| In the past 7 days, I had a problem with my sleep | 0.60 | |||
| In the past 7 days, I had difficulty falling asleep | 0.58 | |||
| Ability to participate in social roles and activities | 15.6 (5.0) | 53.1 (11.4) | 0.95 | |
| I have trouble doing all of my regular leisure activities with others | 0.87 | |||
| I have trouble doing all of the family activities that I want to do | 0.89 | |||
| I have trouble doing all of my usual work (include work at home) | 0.85 | |||
| I have trouble doing all of the activities with friends that I want to do | 0.86 | |||
| Pain interference | 7.0 (4.1) | 50.1 (9.3) | 0.95 | |
| In the past 7 days, how much did pain interfere with your day-to-day activities? | 0.87 | |||
| In the past 7 days, how much did pain interfere with work around the home? | 0.89 | |||
| In the past 7 days, how much did pain interfere with your ability to participate in social activities? | 0.92 | |||
| In the past 7 days, how much did pain interfere with your household chores? | 0.88 | |||
| Pain intensity | 2.2 (2.3) | – | – | – |
SD, standard deviation.