Table 2
A mixed-effects Γ regression model of paediatric length of stay in intensive care units in Australia and New Zealand
| Parameter | Coefficient (β) | 95% CI | exp (β) | p Value > |;t|; |
| Respiratory support in the first hour | 0.68 | 0.66 to 0.69 | 1.96 | <0.0001 |
| Elective admission | −0.19 | −0.21 to −0.16 | 0.83 | <0.0001 |
| Retrieval | 0.08 | 0.05 to 0.11 | 1.08 | <0.0001 |
| Systolic blood pressure | ||||
| SBP (value) | −0.02 | −0.02 to −0.02 | 0.98 | <0.0001 |
| SBP2 (value*value) | 0.00 | 0.00 to 0.00 | 1.00 | <0.0001 |
| Age (in years at admission) | −0.01 | −0.01 to −0.01 | 0.99 | <0.0001 |
| Pupils fixed to light | 0.48 | 0.33 to 0.64 | 1.62 | <0.0001 |
| Diagnostic group | ||||
| Diagnostic group 1 | −0.58 | −0.61 to −0.55 | <0.0001 | |
| Diagnostic group 2 | −0.27 | −0.30 to −0.25 | 0.56 | <0.0001 |
| Diagnostic group 3 | Reference | 0.76 | ||
| Diagnostic group 4 | 0.29 | 0.27 to 0.32 | 1.34 | <0.0001 |
| Diagnostic group 5 | 0.58 | 0.54 to 0.61 | 1.78 | <0.0001 |
| Recovery from a procedure? | ||||
| No | Reference | |||
| Yes, recovery from a bypass procedure | −0.16 | −0.21 to −0.12 | 0.85 | <0.0001 |
| Yes, recovery from other procedure | 0.06 | 0.02 to 0.09 | 1.06 | 0.0036 |
| ICU admission source | ||||
| Operating theatre or recovery | −0.09 | −0.13 to −0.05 | 0.92 | 0.0003 |
| Emergency department | −0.06 | −0.09 to −0.02 | 0.94 | 0.0027 |
| Ward | 0.17 | 0.14 to 0.21 | 1.19 | <0.0001 |
| Other ICU or NICU (same hospital) | 0.28 | 0.15 to 0.42 | 1.33 | 0.0002 |
| Direct ICU admission | Reference | |||
| Previous admission | ||||
| No | Reference | |||
| Yes , readmitted <48 h after discharge | 0.21 | 0.16 to 0.26 | 1.23 | <0.0001 |
| Yes, readmitted >48 h after discharge | 0.25 | 0.22 to 0.29 | 1.29 | <0.0001 |
| Intercept | 1.79 | 1.62 to 1.95 | 5.97 | <0.0001 |
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ICU, intensive care unit; SBP, systolic blood pressure.
