THU0542 Pain Catastrophizing and Self-Efficacy as Determinants of Subjective and Objective Physical Function in Women with fibromyalgia: The al-Άndalus Project

BackgroundA discrepancy between subjective (i.e., patients' perceptions) and objective (i.e., clinical observations) of physical function (PF) has been reported in fibromyalgia (FM). This discordance, with a worse subjective PF than objective PF, may have negative consequences for health-related outcomes such as the ability to pursue valued activities in daily life. Therefore, it seems important to find modifiable factors associated with this discrepancy between objective and subjective PF in FM.ObjectivesThe present cross-sectional study examined 1) the existence of discordance between subjective and objective PF, 2) the independent association of catastrophizing and self-efficacy with subjective and objective PF, and 3) the independent association of catastrophizing and self-efficacy with the discrepancy between subjective and objective PF.MethodsA total of 427 FM women filled out the Pain Catastrophizing Scale, Chronic Pain Self-efficacy Scale, and PF subscales of the SF-36 (SF-36-PF) and of the Revised FM Impact Questionnaire (FIQ-R-PF). Objective PF was measured by performance-based tests: the Senior Physical Fitness Test Battery plus handgrip strength test. Subjective and objective PF were transformed to standardized z-scores ([value-mean]/standard deviation; using means and standard deviations of a general population sample, n=230). These scores reflect the deviation of FM patients from the general population in standard deviation units.ResultsIn one-way analysis of variance (ANOVA), subjective PF was poorer than objective PF (P