Fig. 2

Prediction nomogram for the 1-month mortality risk in neonates with CDH.

Abbreviations: CDH, congenital diaphragmatic hernia; GA, gestational age; o/e LHR, observed-to-expected lung-to-head ratio; PH, pulmonary hypertension; OI, oxygen index. According to the clinical characteristics of a CDH neonate, the scores for each independent predictor can be obtained and summed. The total score obtained is projected downward to obtain the probability of 1-month mortality for this neonate. Each factor is assigned a weighted total score, which indicates the probability of 1-month mortality of patients with CDH. Definitions of factors in this nomogram model: for gender, 0 represents female and 1 represents male; for GA of prenatal diagnosis, it ranges within 16–40 weeks; for birth weight, it ranges within 1–4.5 kg; for liver herniation, 0 represents without liver herniation and 1 represents with liver herniation; for o/e LHR, it ranges within 20–90%; for severity of PH, 0 represents trivial or mild PH and 1 represents moderate to severe PH; for diameter of defect (classification by quartiles), 1 represents diameter of defect less than 3 cm, 2 represents diameter of defect equal or greater than 3 cm and less than 3.75 cm, 3 represents diameter of defect equal or greater than 3.75 cm and less than 4 cm, and 4 represents diameter of defect equal or greater than 4 cm; for OI (classification by quartiles), 1 represents OI less than 2.5, 2 represents OI equal or greater than 2.5 and less than 4, 3 represents OI equal or greater than 4 and less than 10, and 4 represents OI equal or greater than 10