Background and aims: Research on real-world outcomes in a general chronic pain population is rare. We aimed to assess factors that predict increased chances of long term clinical success in management of chronic pain conditions. 
Methods: The Oslo University Hospital Pain Registry (OPR) is the local registry of the largest university and interdisciplinary outpatient pain clinic in Norway. We analyzed baseline and 12 month follow-up data on 453 patients with complete data records. Primary outcome was the Patients' Global Impression of Change (PGIC). For clinical purpose we converted the original PGIC 7 point Likert scale to a binary outcome: success (clinically significant improvement) and failure (ranging from clinically insignificant improvement to clinically significant deterioration). We included patients’ age, sex, cohabitation, employment, litigation, pain duration, number of painful regions, pain intensity, pain bothersomeness, self-rated activity level, self-rated health, psychological distress, quality of life, function, self-efficacy, functional disorders, fatigue, sleep, pain catastrophizing, and experienced injustice as independent variables in the direct logistic regression analysis. 
Results: Baseline variables that significantly contributed to success were: work status (employed/students (part/full time)); pain duration (less than two years); and low score on the pain catastrophizing scale (<25/52). These factors almost doubled the odds for success. 
Conclusions: In this preliminary analysis of real-world data on baseline predictors for clinical success at 12 months follow-up, most variables had no clinically significant impact on the outcome. Exceptions were being employed or student, less than 2 years pain duration, and low tendency to pain catastrophizing.

PRELIMINARY ANALYSIS OF PREDICTORS OF SUCCSESS AT 12 MONTH FOLLOW-UP IN A GENERAL CHRONIC PAIN POPULATION - THE OSLO UNIVERSITY HOSPITAL PAIN REGISTRY PREDICTOR STUDY