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To date, the score has been implemented with considerable variation in literature and initial positive evaluations were not reproduced in subsequent studies. In this study, we investigate the computation of MISI on oral OGTT data with differing sampling schedules and aim to standardise and improve its calculation. Seven time point OGTT data for 2631 individuals from the Maastricht Study and seven time point OGTT data combined with a hyperinsulinemic-euglycaemic clamp for 71 individuals from the PRESERVE Study were used to evaluate the performance of MISI. MISI was computed on subsets of OGTT data representing four and five time point sampling schedules to determine minimal requirements for accurate computation of the score. A modified MISI computed on cubic splines of the measured data, resulting in improved identification of glucose peak and nadir, was compared with the original method yielding an increased correlation (\u03c1\u2009=\u20090.576) with the clamp measurement of peripheral insulin sensitivity as compared to the original method (\u03c1\u2009=\u20090.513). Finally, a standalone MISI calculator was developed allowing for a standardised method of calculation using both the original and improved methods.<\/jats:p>","DOI":"10.1038\/s41598-019-45858-w","type":"journal-article","created":{"date-parts":[[2019,6,28]],"date-time":"2019-06-28T10:03:14Z","timestamp":1561716194000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":40,"title":["Improved quantification of muscle insulin sensitivity using oral glucose tolerance test data: the MISI Calculator"],"prefix":"10.1038","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2253-4903","authenticated-orcid":false,"given":"Shauna D.","family":"O\u2019Donovan","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael","family":"Lenz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gijs H.","family":"Goossens","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carla J. 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