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