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The Spider questionnaire was developed to evaluate the presence and impact of eight common multisystemic comorbidities. Thirty-one questions across eight symptom domains assess neuromusculoskeletal, pain, fatigue, cardiac dysautonomia, urogenital, gastrointestinal, anxiety, and depression symptoms. This study aimed to evaluate the Spider\u2019s construct validity in adults.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Method<\/jats:title>\n                <jats:p>A cross-sectional observational study was conducted over four stages. Three international patient charities aided recruitment of participants through social media and website advertisements. Adults aged 18 to 65\u00a0years, with and without HSD\/hEDS, were invited to participate. Validated, frequently used comparator questionnaires were used to establish convergent validity of Spider symptom domains. A control group was recruited for known-group validity analysis. Participants answered each Spider domain and the corresponding comparator questionnaire via surveys hosted by REDCap. Anonymous data were analysed using SPSS. Convergent validity was assessed through Spearman\u2019s correlational analysis and known-group validity through Mann\u2013Whitney <jats:italic>U<\/jats:italic> analysis.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>A total of 11,151 participants were recruited across the four stages. Statistically significant, moderate-to-strong correlations were found between all Spider domains and their comparators (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001, <jats:italic>r<\/jats:italic>\u2009=\u20090.63 to 0.80). Known-group validity analysis showed statistically significant differences (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001) between the hypermobile and control groups in all eight domains.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Convergent and known-group validity of the Spider was established with adults. These results suggest the Spider can measure the presence and impact of multisystemic comorbid symptoms\/conditions in adults with HSD\/hEDS, providing a tool which guides multidisciplinary management.<jats:table-wrap><jats:table><jats:tbody>\n                      <jats:tr>\n                        <jats:td align=\"left\" colspan=\"2\"><jats:bold>Key Points<\/jats:bold>\u2022 <jats:italic>The Spider questionnaire is a novel tool assessing the presence and impact of the multisystemic comorbid symptoms\/conditions associated with HSD\/hEDS.<\/jats:italic>\u2022 <jats:italic>Convergent and known-group validity of the Spider questionnaire was established in adults aged 18 to 65.<\/jats:italic>\u2022 <jats:italic>This tool provides a quick and easy method to visualise the symptom profile of those with HSD\/hEDS to guide symptom management.<\/jats:italic><\/jats:td>\n                      <\/jats:tr>\n                    <\/jats:tbody><\/jats:table><\/jats:table-wrap><\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s10067-024-07071-7","type":"journal-article","created":{"date-parts":[[2024,7,31]],"date-time":"2024-07-31T17:25:02Z","timestamp":1722446702000},"page":"3005-3017","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["The Spider: a visual, multisystemic symptom impact questionnaire for people with hypermobility-related disorders\u2014validation in adults"],"prefix":"10.1007","volume":"43","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-0038-5612","authenticated-orcid":false,"given":"E. 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