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According to whether intubation was successfully accomplished by simple Macintosh laryngoscopy, patients were divided into Macintosh laryngoscopy group (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200978) and Assistant technique group (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200926). We measured patients\u2019 radiographical data via their preoperative X-ray and MRI images, and compared the differences between two groups. Binary logistic regression model was applied to distinguish the meaningful predictors. Receiver operating characteristic (ROC) curve and area under the curve (AUC) were used to describe the discrimination ability of indicators. The highest Youden\u2019s index corresponded to an optimal cut-off value.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Ten variables exhibited significant statistical differences between two groups (\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u2009\u00a00.05). Based on logistic regression model, four further showed correlation with the application of assistant techniques, namely, perpendicular distance from hard palate to tip of upper incisor (X2), atlanto-occipital gap (X9), angle between a line passing through posterior-superior point of hard palate and the lowest point of the occipital bone and a line passing through the anterior-inferior point and the posterior-inferior point of the second cervical vertebral body (Angle E), and distance from skin to hyoid bone (MRI 7). Angle E owned the largest AUC (0.929), and its optimal cut-off value was 19.9\u00b0 (sensitivity\u2009=\u200988.5%, specificity\u2009=\u200991.0%). the optimal cut-off value, sensitivity and specificity of other three variables were X2 (30.1\u2009mm, 76.9, 76.9%), MRI7 (16.3\u2009mm, 69.2, 87.2%), and X9 (7.3\u2009mm, 73.1, 56.4%).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Four radiological variables possessed potential ability to predict the application of assistant intubation techniques. Anaesthesiologists are recommended to apply assistant techniques more positively once encountering the mentioned cut-off values.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12871-020-01153-0","type":"journal-article","created":{"date-parts":[[2020,9,17]],"date-time":"2020-09-17T13:03:19Z","timestamp":1600347799000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Radiological indicators to predict the application of assistant intubation techniques for patients undergoing cervical surgery"],"prefix":"10.1186","volume":"20","author":[{"given":"Bingchuan","family":"Liu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanan","family":"Song","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kaixi","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fang","family":"Zhou","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongquan","family":"Ji","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yun","family":"Tian","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yong Zheng","family":"Han","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,9,17]]},"reference":[{"key":"1153_CR1","doi-asserted-by":"publisher","unstructured":"Schumacher J, Arlidge J, Dudley D, et al. 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