Key references: Impact of pain on a patient’s function

Cleeland C, Pain Research Group of the WHO Collaborating Centre for Symptom Evaluation in Cancer Care. The Brief Pain Inventory (short form). Houston, TX: The University of Texas MD Anderson Cancer Center; 1991. https://www.mdanderson.org/research/departments-labs-institutes/departments-divisions/symptom-research/symptom-assessment-tools/brief-pain-inventory.html
Krebs EE, Lorenz KA, Bair MJ, Damush TM, Wu J, Sutherland JM, et al. Development and initial validation of the PEG, a three-item scale assessing pain intensity and interference. J Gen Intern Med 2009;24(6):733–8. https://www.ncbi.nlm.nih.gov/pubmed/19418100
Schug S, Palmer GM, Scott DA, Halliwell R, Trinca J, APM:SE Working Group of the Australian and New Zealand College of Anaesthetists and Faculty of Pain Medicine, editors . Acute pain management: scientific evidence. 4th Melbourne: Australian and New Zealand College of Anaesthetists and Faculty of Pain Medicine; 2015. https://www.anzca.edu.au/safety-advocacy/advocacy/college-publications
Scott DA, McDonald WM. Assessment, measurement and history. In: Clinical pain management: Acute pain. 2nd Boca Raton, FL: CRC Press; 2019.
Traeger AC, Hubscher M, Henschke N, Moseley GL, Lee H, McAuley JH. Effect of primary care-based education on reassurance in patients with acute low back pain: Systematic review and meta-analysis. JAMA Intern Med 2015;175(5):733–43. https://www.ncbi.nlm.nih.gov/pubmed/25799308