Table 1.

Postnatal risk stratification system for congenital diaphragmatic hernia

	Definition
Category 0	No need for respiratory care within 24 h after birth
Category 1	Neither Ap1 of 0–4 nor best OI ≥ 8.0
Category 2	Either Ap1 of 0–4 or best OI ≥ 8.0
Category 3	Both Ap1 of 0–4 and best OI ≥ 8.0
Category 4	No OI due to death prior to intubation (including fetal death and dead birth)

Ap1 Apgar score at 1 min; OI oxygenation index

This table has been adapted from Terui et al. [12]