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Responsiveness was calculated using the area under the receiver operating characteristic (ROC). The minimal important change (MIC) was calculated with an anchor-based method and distribution-based methods. For the anchor-based method we used the Patient Global Impression of Change (PGIC) as the anchor. The PGIC was on a 7-point Likert scale, and trichotomized into three ordinal categories.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>A total of 551 patients with neck pain were included. Among these patients, 60% were women with an average age of 48, and 63% had experienced neck pain for more than one year. For improved patients NDI and NRSa had adequate responsiveness at both follow-ups. MIC calculations using an anchor-based method were more accurate than those using a distribution-based method, which fell below the measurement error for the instruments. Using anchor-based calculation of MIC, the MIC for NDI was 17 at the 6-months follow-up and 9 at 12-months follow-up. Correspondingly, NRSa had a MIC of 2.5 at both follow-ups.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>NDI and NRSa were responsive at both 6-months and 12-months follow-up and can be used in registries following patients with neck pain over time.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00586-025-08836-7","type":"journal-article","created":{"date-parts":[[2025,4,24]],"date-time":"2025-04-24T08:25:54Z","timestamp":1745483154000},"page":"2219-2226","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Responsiveness and minimal important change of neck disability index and numeric pain rating scale for neck patients in the Norwegian neck and back register"],"prefix":"10.1007","volume":"34","author":[{"given":"Bj\u00f8rneboe","family":"John","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cecilie","family":"R\u00f8e","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jens Ivar","family":"Brox","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H\u00e5kon","family":"Sveinall","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Janica","family":"Ignatius","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maja","family":"Wilhelmsen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sigrid","family":"Skatteboe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,4,24]]},"reference":[{"issue":"1","key":"8836_CR1","doi-asserted-by":"publisher","first-page":"118","DOI":"10.1136\/ard.2003.019349","volume":"64","author":"SD Bot","year":"2005","unstructured":"Bot SD, van der Waal JM, Terwee CB, van der Windt DA, Schellevis FG, Bouter LM, Dekker J (2005) Incidence and prevalence of complaints of the neck and upper extremity in general practice. 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