Table 3.
Exploratory factor analysis
| Original domain and items | Factor loading | |||||
|---|---|---|---|---|---|---|
| F1 | F2 | F3 | F4 | F5 | F6 | |
| Physical Function | ||||||
| Chores such as vacuuming or yard work? | 0.84 | 0.01 | − 0.11 | 0.23 | 0.08 | − 0.01 |
| Go up and down stairs at a normal pace? | 0.80 | 0.12 | − 0.02 | 0.22 | 0.00 | − 0.06 |
| Go for a walk of at least 15 min? | 0.87 | 0.04 | − 0.08 | 0.21 | 0.04 | − 0.03 |
| Are you able to run errands and shop? | 0.90 | 0.06 | − 0.04 | 0.21 | 0.03 | − 0.01 |
| Anxiety | ||||||
| In the past 7 days, I felt fearful | 0.14 | 0.25 | 0.25 | 0.75 | − 0.01 | − 0.05 |
| In the past 7 days, I found it hard to focus on anything other than my anxiety | 0.11 | 0.29 | 0.40 | 0.62 | 0.07 | − 0.09 |
| In the past 7 days, my worries overwhelmed me | 0.07 | 0.15 | 0.31 | 0.76 | 0.01 | 0.01 |
| In the past 7 days, I felt uneasy | 0.12 | 0.21 | 0.45 | 0.68 | 0.09 | − 0.04 |
| Depression | ||||||
| In the past 7 days, I felt worthless | 0.08 | 0.00 | 0.65 | 0.39 | 0.00 | − 0.08 |
| In the past 7 days, I felt helpless | 0.09 | 0.25 | 0.71 | 0.29 | − 0.01 | − 0.07 |
| In the past 7 days, I felt depressed | 0.05 | 0.18 | 0.70 | 0.36 | 0.02 | − 0.08 |
| In the past 7 days, I felt hopeless | 0.03 | 0.06 | 0.72 | 0.23 | 0.06 | − 0.01 |
| Fatigue | ||||||
| During the past 7 days, I feel fatigued | 0.11 | 0.34 | 0.64 | 0.16 | 0.17 | − 0.05 |
| During the past 7 days, I have trouble starting things because I am tired | 0.13 | 0.43 | 0.53 | 0.25 | 0.26 | 0.02 |
| In the past 7 days, how run-down did you feel on average? | 0.00 | 0.42 | 0.60 | 0.18 | 0.20 | − 0.01 |
| In the past 7 days, how fatigued were you on average? | 0.02 | 0.38 | 0.70 | 0.06 | 0.25 | − 0.03 |
| Sleep disturbance | ||||||
| In the past 7 days, my sleep quality was | − 0.15 | − 0.07 | − 0.04 | − 0.03 | − 0.16 | 0.87 |
| In the past 7 days, my sleep was refreshing | − 0.02 | − 0.08 | − 0.06 | − 0.04 | − 0.04 | 0.90 |
| In the past 7 days, I had a problem with my sleep | 0.02 | 0.15 | 0.12 | − 0.01 | 0.92 | − 0.11 |
| In the past 7 days, I had difficulty falling asleep | 0.00 | 0.11 | 0.07 | 0.05 | 0.95 | − 0.05 |
| Ability to participate in social roles and activities | ||||||
| I have trouble doing all of my regular leisure activities with others | 0.81 | 0.19 | 0.17 | − 0.14 | − 0.02 | − 0.05 |
| I have trouble doing all of the family activities that I want to do | 0.83 | 0.20 | 0.20 | − 0.09 | − 0.04 | − 0.05 |
| I have trouble doing all of my usual work (include work at home) | 0.88 | 0.21 | 0.10 | − 0.08 | − 0.03 | − 0.06 |
| I have trouble doing all of the activities with friends that I want to do | 0.84 | 0.26 | 0.19 | − 0.13 | 0.01 | − 0.03 |
| Pain interference | ||||||
| In the past 7 days, how much did pain interfere with your day to day activities? | 0.18 | 0.86 | 0.08 | 0.18 | 0.11 | − 0.05 |
| In the past 7 days, how much did pain interfere with work around the home? | 0.19 | 0.89 | 0.15 | 0.07 | 0.08 | − 0.05 |
| In the past 7 days, how much did pain interfere with your ability to participate in social activities? | 0.18 | 0.86 | 0.26 | 0.11 | 0.10 | − 0.01 |
| In the past 7 days, how much did pain interfere with your household chores? | 0.19 | 0.86 | 0.20 | 0.09 | 0.07 | − 0.04 |
| Pain intensity | 0.11 | 0.75 | 0.05 | 0.15 | 0.08 | − 0.14 |
The highest loading has been highlighted in bold for each item