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. 2021 Oct;13(10):5752–5764. doi: 10.21037/jtd-21-591

Table 3. Exploratory factor analysis.

Original domain and items Factor loading
F1 F2 F3 F4 F5 F6
Physical function
   Are you able to do chores such as vacuuming or yard work? 0.91 −0.07 0.12 0.00 0.06 0.15
   Are you able to go up and down the stairs at a normal pace? 0.86 −0.01 0.08 0.03 0.07 −0.04
   Are you able to go for a walk of at least 15 min? 0.94 0.02 0.05 −0.08 0.06 0.13
   Are you able to run errands and shop? 0.93 0.03 0.14 −0.04 0.03 0.08
Anxiety
   In the past 7 days, I felt fearful 0.05 0.22 0.69 0.35 −0.07 −0.08
   In the past 7 days, I found it hard to focus on anything other than my anxiety 0.09 0.30 0.64 0.42 −0.18 −0.07
   In the past 7 days, my worries overwhelmed me 0.06 0.22 0.66 0.46 −0.15 −0.01
   In the past 7 days, I felt uneasy 0.12 0.32 0.58 0.50 −0.08 0.02
Depression
   In the past 7 days, I felt worthless 0.17 0.17 0.27 0.82 0.08 0.03
   In the past 7 days, I felt helpless 0.10 0.21 0.32 0.81 0.11 −0.02
   In the past 7 days, I felt depressed 0.13 0.21 0.34 0.79 0.03 0.05
   In the past 7 days, I felt hopeless 0.14 0.14 0.34 0.81 0.04 −0.06
Fatigue
   During the past 7 days, I felt fatigued 0.15 0.28 0.74 0.35 0.08 −0.02
   During the past 7 days, I had trouble starting things because I felt tired 0.12 0.38 0.70 0.26 0.18 −0.10
   In the past 7 days, how run-down did you feel on average? 0.10 0.29 0.77 0.26 0.23 −0.09
   In the past 7 days, how fatigued were you on average? 0.15 0.30 0.78 0.21 0.14 −0.04
Sleep disturbance
   In the past 7 days, my sleep quality was −0.20 0.05 −0.08 0.01 −0.15 0.87
   In the past 7 days, my sleep was refreshing −0.01 −0.02 −0.07 0.00 −0.07 0.91
   In the past 7 days, I had a problem with my sleep 0.06 0.21 0.10 0.08 0.89 −0.06
   In the past 7 days, I had difficulty falling asleep 0.10 0.11 0.03 0.04 0.90 −0.15
Ability to participate in social roles and activities
   I have trouble doing all of my regular leisure activities with others 0.83 0.08 0.02 0.29 0.01 −0.24
   I have trouble doing all of the family activities that I want to do 0.86 0.12 0.07 0.23 0.01 −0.19
   I have trouble doing all of my usual work (include work at home) 0.87 0.19 0.09 0.18 −0.04 −0.18
   I have trouble doing all of the activities with friends that I want to do 0.86 0.16 −0.01 0.22 0.08 −0.23
Pain interference
   In the past 7 days, how much did pain interfere with your day-to-day activities? 0.06 0.89 0.20 0.12 0.11 −0.04
   In the past 7 days, how much did pain interfere with work around the home? 0.08 0.86 0.32 0.08 0.06 −0.03
   In the past 7 days, how much did pain interfere with your ability to participate in social activities? 0.07 0.87 0.32 0.14 0.07 −0.05
   In the past 7 days, how much did pain interfere with your household chores? 0.04 0.89 0.18 0.21 0.08 0.05
Pain intensity 0.11 0.78 0.11 0.22 0.14 0.12