10.1371/journal.pone.0161874.g002 Mikhail Saltychev Mikhail Saltychev Heidi Vastamäki Heidi Vastamäki Ryan Mattie Ryan Mattie Zachary McCormick Zachary McCormick Martti Vastamäki Martti Vastamäki Katri Laimi Katri Laimi Psychometric Properties of the Pain Numeric Rating Scale When Applied to Multiple Body Regions among Professional Musicians - Fig 2 Public Library of Science 2016 pain NRS numeric rating scale Professional Musicians Background psychometric properties Item Response Theory pain severity meaning Pain Numeric Rating Scale CI Methods Cross-sectional survey study IRT discrimination ability Multiple Body Regions body area 2016-09-07 17:36:24 Figure https://plos.figshare.com/articles/figure/Psychometric_Properties_of_the_Pain_Numeric_Rating_Scale_When_Applied_to_Multiple_Body_Regions_among_Professional_Musicians_-_Fig_2/3812475 <p><b>Test information curve of numeric rating scales when applied to pain in neck-1 (left image), neck-2 (middle image), and shoulder (right image).</b> Y-axis–Amount of information (inverse standard error) obtainable from a test; X-axis–Level of pain perceived by the respondents.</p>