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This multicenter study recruited patients from international hip arthroscopy and arthroplasty surgeon practices. The outcome was created using a process of item generation (51 patients), item reduction (150 patients), and pretesting (31 patients). The questionnaire was tested for test\u2010retest reliability (123 patients); face, content, and construct validity (51 patients); and responsiveness over a 6\u2010month period in post\u2010arthroscopy patients (27 patients).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Initially, 146 items were identified. This number was reduced to 60 through item reduction, and the items were categorized into 4 domains: (1) symptoms and functional limitations; (2) sports and recreational physical activities; (3) job\u2010related concerns; and (4) social, emotional, and lifestyle concerns. The items were then formatted using a visual analog scale. Test\u2010retest reliability showed Pearson correlations greater than 0.80 for 33 of the 60 questions. The intraclass correlation statistic was 0.78, and the Cronbach \u03b1 was .99. Face validity and content validity were ensured during development, and construct validity was shown with a correlation of 0.81 to the Non\u2010Arthritic Hip Score. Responsiveness was shown with a paired\n                      <jats:italic>t<\/jats:italic>\n                      test (\n                      <jats:italic>P<\/jats:italic>\n                      \u2264 .01), effect size of 2.0, standardized response mean of 1.7, responsiveness ratio of 6.7, and minimal clinically important difference of 6 points.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>We have developed a new quality\u2010of\u2010life patient\u2010reported outcome measure, the 33\u2010item International Hip Outcome Tool (iHOT\u201033). This questionnaire uses a visual analog scale response format designed for computer self\u2010administration by young, active patients with hip pathology. Its development has followed the most rigorous methodology involving a very large number of patients. The iHOT\u201033 has been shown to be reliable; shows face, content, and construct validity; and is highly responsive to clinical change. In our opinion the iHOT\u201033 can be used as a primary outcome measure for prospective patient evaluation and randomized clinical trials.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1016\/j.arthro.2012.03.013","type":"journal-article","created":{"date-parts":[[2012,4,26]],"date-time":"2012-04-26T17:39:11Z","timestamp":1335461951000},"page":"595","update-policy":"https:\/\/doi.org\/10.1016\/elsevier_cm_policy","source":"Crossref","is-referenced-by-count":454,"title":["The Development and Validation of a Self\u2010Administered Quality\u2010of\u2010Life Outcome Measure for Young, Active Patients With Symptomatic Hip Disease: The International Hip Outcome Tool (iHOT\u201033)"],"prefix":"10.1002","volume":"28","author":[{"given":"Nicholas G.H.","family":"Mohtadi","sequence":"first","affiliation":[{"name":"University of Calgary Sport Medicine Centre Calgary Alberta Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Damian R.","family":"Griffin","sequence":"additional","affiliation":[{"name":"Warwick Medical School University of Warwick Coventry England"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M. 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