Table 1.

Chinese Neonatal Network data variables

Categories	Variables
Demographic	Birth weight gestation, sex, ethnicity, small for gestational age.
Obstetric/perinatal risks	Maternal age education, smoking, drugs in pregnancy, antenatal care, antenatal complications, hypertension preterm labour, preterm rupture of membranes, maternal diabetes, group B Strep chorioamnionitis, multiple gestation, antenatal steroids, delivery mode presentation, drug treatment, delivery complications, Apgar score, resuscitation.
NICU care	Admission illness severity (SNAP, TRIPS), fluids, nutrition, assisted respiration, antibiotics, drug therapy, intravenous lines, catheters procedures, surgery.
Outcomes	Primary—survival without major morbidity (BPD, SNI, ROP, NEC, NI). Secondary outcomes—death, BPD, SNI, ROP, NEC, NI, patent ductus arteriosus, air leak syndrome.
Resource use	Duration of hospitalisation, duration of ventilation, duration of oxygen therapy, use of central catheters, parenteral nutrition, surgery.

BPD, bronchopulmonary dysplasia; NEC, necrotising enterocolitis; NI, nosocomial infection; NICU, neonatal intensive care unit; ROP, retinopathy of prematurity; SNAP, score for neonatal acute physiology; SNI, severe neurological injury; TRIPS, transport risk index of physiologic stability.