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

From: 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

Factors Two factors Three factors without item ‘sleep’ Three factor-1 Three factor-2
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 REM REM REM REM, sleep REM, sleep REM
  1. WLAN—the pain severity items (W—worst, L—least, A—average, N—now)
  2. REM—the affective cluster of interference items (R—relations with others, E—enjoyment of life and M—mood),
  3. WAW—the activity cluster of interference items (W—walking, A—general activity and W—work)