Background and aims: 
It was recently demonstrated that the consideration of impairment of QoL (Quality of Life) and functionality in addition to symptom intensity are important for treatment evaluation of chronic LBP (Low-back pain) and might enhance efficacy in clinical pain trials and patient-centered treatment (Gierthmühlen et al., CMRO 2017). Based on these results, the aim of this study was to establish a new questionnaire (Q-SAP Back) and investigate its validity and reliability. 
Methods:
152 Patients ≥ 18 years with chronic low back pain with or without radiculopathy, lasting for at least 3 months, NRS ≥ 3 were included. After informed consent and clinical examination the patients were asked to complete the QSAP-Back and a set of PRO (patient reported outcomes). This assortment of questionnaires was filled out at three different points of time (1st visit, 3h after 1st visit, and 4 weeks after 1st visit). Analysis was made for test-retest reliability, frequencies of symptoms, and sensitivity to change.

VALIDATION OF THE Q-SAP BACK (QUESTIONNAIRE FOR SYMPTOM ASSESSMENT IN PAIN DISORDERS FOR BACK PAIN PATIENTS)