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The area under the ROC curve of the nomogram predicting PTB 37 weeks and PTB 34 weeks were 0.803 and 0.771, respectively. Both models showed good discrimination. Gestational age at first observation of short cervix, CL of short cervix and other factors are strong predictors of PTB in pregnancies with a short cervix. Both nomograms showed good discrimination and calibration, and hence might be effective in predicting PTB for this population. Gestational age at first observation of short cervix, CL of short cervix and other factor