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The primary model was constructed using ten selected variables, as previously defined in seventeen different studies. The ability of the model to predict PD was evaluated using the combined measurement from these variables. Therefore, a prospective investigation was performed by enrolling 130 pregnant patients whose gestational ages varied from 17<jats:sup>+0<\/jats:sup> to 28<jats:sup>+6<\/jats:sup> weeks. The patients underwent epidemiological surveys and ultrasonographic measurements of their cervixes, and cervicovaginal fluid and serum were collected during a routine speculum examination performed by the managing gynecologist. The results showed eight significant variables were included in the present analysis, and combination of the positive variables indicated an increased probability of PD in pregnant patients. The accuracy for predicting PD were as follows: one positive \u2013 42.9%; two positives \u2013 75.0%; three positives \u2013 81.8% and four positives \u2013 100.0%. In particular, the combination of \u22652\u00d7 positives had the best predictive value, with a relatively high sensitivity (82.6%), specificity (88.1%) and accuracy rate (79.2%), and was considered the cut-off point for predicting PD. In conclusion, the new model provides a useful reference for evaluating the risk of PD in clinical cases.<\/jats:p>","DOI":"10.1038\/s41598-017-11286-x","type":"journal-article","created":{"date-parts":[[2017,9,6]],"date-time":"2017-09-06T22:32:37Z","timestamp":1504737157000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["New model for predicting preterm delivery during the second trimester of pregnancy"],"prefix":"10.1038","volume":"7","author":[{"given":"Ya-zhi","family":"Zhu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guo-qin","family":"Peng","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gui-xiang","family":"Tian","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xue-ling","family":"Qu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shui-yuan","family":"Xiao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2017,9,12]]},"reference":[{"key":"11286_CR1","doi-asserted-by":"publisher","first-page":"31","DOI":"10.2471\/BLT.08.062554","volume":"88","author":"S Beck","year":"2010","unstructured":"Beck, S. et al. 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