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The validity of and patient affinity for this type of questionnaire was compared with that of three other established subjective evaluation methods. <\/jats:p><jats:p> The visual analog scale system was shown to be valid and comparable to other methods while offering several advantages. It brought greater sensitivity and greater statistical power to data collection and analysis by allowing a broader range of responses than did traditional categorical responses. It removed bias that was introduced by examiner questioning, and it allowed graphic temporal comparisons. Most importantly, pa tient affinity was higher for this type of subjective evaluation than for other methods. <\/jats:p>","DOI":"10.1177\/036354659101900204","type":"journal-article","created":{"date-parts":[[2007,6,22]],"date-time":"2007-06-22T00:46:52Z","timestamp":1182473212000},"page":"112-118","source":"Crossref","is-referenced-by-count":294,"title":["Analysis of subjective knee complaints using visual analog scales"],"prefix":"10.1177","volume":"19","author":[{"given":"Fred","family":"Flandry","sequence":"first","affiliation":[{"name":"Hughston Orthopaedic Clinic, Hughston Orthopaedic Clinic"}]},{"given":"Jon P.","family":"Hunt","sequence":"additional","affiliation":[{"name":"Hughston Sports Medicine Foundation, Columbus, Georgia"}]},{"given":"Glenn C.","family":"Terry","sequence":"additional","affiliation":[{"name":"Hughston Orthopaedic Clinic, Columbus, Georgia"}]},{"given":"Jack C.","family":"Hughston","sequence":"additional","affiliation":[{"name":"Hughston Orthopaedic Clinic, Columbus, Georgia"}]}],"member":"179","published-online":{"date-parts":[[1991,3,1]]},"reference":[{"key":"atypb1","doi-asserted-by":"crossref","unstructured":"Aichroth P., Freeman Mar, Smillie IS, et al. 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