Description of variables in the ANZPIC Registry
| Variable | Variable description | Variable type | Missing values (%) |
| ICU length of stay | Patient length of stay in ICU measured in days | Continuous | 0 (0.0) |
| Respiratory support in the first hour* | Mechanical respiratory support given within the first hour of admission (0/1; no/yes) | Binary | 0 (0.0) |
| Elective admission* | Was the admission elective? (0/1; no/yes) | Binary | 0 (0.0) |
| Retrieval | Patient required specialist retrieval team? (0/1; no/yes) | Binary | 43 (0.1) |
| Systolic blood pressure* | Systolic blood pressure (mm Hg) | Continuous | 4025 (7.9) |
| Age | Age in years at admission (eg, 18-month-old has age=1.5) | Continuous | 0 (0.0) |
| Pupils fixed to light* | Pupillary reaction to light fixed? (0/1; no/yes) | Binary | 0 (0.0) |
| Principal diagnosis | ANZPIC diagnostic coding | Categorical | 5 (<0.1) |
| Recovery from a procedure* | (0) No; (1) yes, recovery from a bypass procedure; (2) yes, recovery from other procedure | Categorical | 0 (0.0) |
| ICU admission source | (1) Direct ICU admission; (2) operating theatre or recovery; (3) emergency department; (4) ward; (5) other ICU or NICU (same hospital), | Categorical | 0 (0.0) |
| Previous admission | (0) No; (1) yes, readmitted <48 h after discharge; (2) yes, readmitted >48 h after discharge | Categorical | 43 (0.1) |
↵* As defined in PIM2.30
ANZPIC, Australian and New Zealand Paediatric Intensive Care; ICU, intensive care unit; NICU, neonatal intensive care unit.