Evaluating psychometric properties of the Short Form Brief Pain Inventory Sinhala Version (SF BPI-Sin) among Sinhala speaking patients with cancer pain in Sri Lanka

Table 6 Factor models of SF BPI in original study and other studies

Factors	Two factors			Three factors without item ‘sleep’			Three factor-1		Three factor-2
Factors	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]
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	WAW, sleep, REM	WAW, sleep, REM	WAW, sleep, REM	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)

ISSN: 2050-7283