Factors
|
Two factors
|
Three factors without item ‘sleep’
|
Three factor-1
|
Three factor-2
|
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Original study [11]
|
Aisyaturridha et al. [41]
|
Ger et al. [21]
|
Saxena et al. [46]
|
Zeng et al. [43]
|
Wu et al. [42]
|
Klepstad et al. [17]
|
Atkinson et al. [45]
|
Cleeland et al. [24]
|
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Severity
|
WLAN
|
WLAN
|
WLAN
|
WLAN
|
WLAN
|
WLAN
|
WLAN
|
WLAN
|
WLAN
|
Activity
|
WAW, sleep, REM
|
WAW, sleep, REM
|
WAW, sleep, REM
|
WAW
|
WAW
|
WAW
|
WAW
|
WAW
|
WAW, sleep
|
Affective
|
REM
|
REM
|
REM
|
REM, sleep
|
REM, sleep
|
REM
|
- WLAN—the pain severity items (W—worst, L—least, A—average, N—now)
- REM—the affective cluster of interference items (R—relations with others, E—enjoyment of life and M—mood),
- WAW—the activity cluster of interference items (W—walking, A—general activity and W—work)