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It also remains unclear if all G93.3 cases would meet the Canada Consensus Criteria (CCC). This article describes a novel methodological approach to addressing selection bias when estimating a CCC population\u2019s characteristics, applying an online respondent-driven sampling approach and validated DePaul University algorithms. In a sample of 660 respondents, we assess possible bias in the G93.3 diagnosis by regressing sociodemographic factors on G93.3 status, controlling for medical factors. Results support suggestions that G93.3 register data are biased against those socially deprived.<\/jats:p>","DOI":"10.1177\/13591053251325690","type":"journal-article","created":{"date-parts":[[2025,3,24]],"date-time":"2025-03-24T12:46:02Z","timestamp":1742820362000},"page":"69-81","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Improving myalgic encephalomyelitis population sampling: Applying an online respondent-driven method to address biases in G93.3 register data"],"prefix":"10.1177","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8321-9427","authenticated-orcid":false,"given":"Anne","family":"Kielland","sequence":"first","affiliation":[{"name":"Fafo Foundation, Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jing","family":"Liu","sequence":"additional","affiliation":[{"name":"Fafo Foundation, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Guri","family":"Tyldum","sequence":"additional","affiliation":[{"name":"Fafo Foundation, Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9972-4425","authenticated-orcid":false,"given":"Leonard","family":"Jason","sequence":"additional","affiliation":[{"name":"DePaul University, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2025,3,24]]},"reference":[{"key":"e_1_3_3_2_1","first-page":"167","article-title":"Two age peaks in the incidence of chronic fatigue syndrome\/myalgic encephalomyelitis: A population-based registry study from Norway 2008\u20132012","volume":"12","author":"Bakken IJ","year":"2014","unstructured":"Bakken IJ, Tveito K, Gunnes N, et al. 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