Reliability and Validity of the IASP Clinical Criteria for Identifying Patients with Nociplastic Pain

For the purposes of the study, in the first phase, clinical vignettes will be created, ie short hypothetical scenarios of patients with chronic musculoskeletal pain. The vignettes will feature patients with and without nocipalstic pain. Initially, two experts will evaluate and characterize which vignettes concern patients with nociplastic pain.

Next, a team of physiotherapists with knowledge of chronic pain and CS will evaluate vignettes twice according to the IASP criteria. There will be an interval of 1 month between the two measurements. One month later, the evaluation will be repeated. The investigators will design an Android application "Algo (s) rithm" to enter the questions of the algorithm. In the second phase, Algo (s)rithm app will use to evaluate patients with chronic pain (including patients with fibromyalgia) and healthy. The investigators will compare the result with PPT measurements in the same population.In the present study the inter-rater and test-retest reliability, criterion validity, construct validity will be examined.

Inclusion criteria

• Adult patients 18-65 years
• with pain > 3months, intensity of at least 3 on a 0-10 numerical pain rating scale on most days
• or patients with fibromyalgia (according to the "criteria for classification of fibromyalgia" by the American college of rheumatology (Wolfe et al 1990)).

Exclusion criteria

• Patients who follow a physical therapy program
• Recent surgery or trauma
• Pregnant women,
• Patients with neurological disorders or systemic diseases