Confirmatory factor analysis to evaluate construct validity of the Brief Pain Inventory (BPI).

e19505 Background: The Brief Pain Inventory (BPI) is a frequently used instrument designed to assess the patient-reported outcome of pain. Prior exploratory factor analysis study results have suggested a two-factor (i.e., pain intensity and pain interference) structure for this instrument; however, since the BPI was developed with an a priori hypothesis of the relationship amongst its items, it follows that investigations of construct validity...