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. 2021 Sep 13;6(9):e005688. doi: 10.1136/bmjgh-2021-005688

Figure 4.

Figure 4

Receiver operating curves (ROC) for classification of preterm infants, (A) <37 weeks and (B) <34 weeks. Model A: 10 newborn characteristics: birth weight, head circumference, chest circumference, foot length, breast bud diameter, breast development, foot surface (plantar creases), skin texture, ankle dorsiflexion, infant sex. Model B: 10 newborn characteristics+LMP. Model C: Birth weight+LMP. Model D: Birth weight+head circumference. The point of each ROC curve intersection with the dotted line shows the point of 80% sensitivity, chosen as a desired threshold of sensitivity for a clinical screening tool. The dot on the ROC curve shows the Youden Index, the point of maximum sensitivity+specificity. AUC, area under the curve; LMP, last menstrual period.