Table 3

Results of flexible parametric survival modelling for survival to 365 days after discharge from PICU

	HR	95% CIs		p Value
Age category
<1 year	Ref
1–4 years	0.83	0.80	0.87	<0.001
5–10 years	0.77	0.73	0.82	<0.001
11–15 years	0.85	0.80	0.90	<0.001
16+	0.98	0.89	1.09	0.72
Sex
Male	Ref
Female	1.02	0.99	1.06	0.23
Ethnicity
Non-South Asian	Ref
South Asian	1.19	1.13	1.25	<0.001
Deprivation category
Category 1 (least deprived)	Ref
Category 2	0.99	0.92	1.05	0.66
Category 3	1.03	0.96	1.09	0.41
Category 4	1.06	1.00	1.13	0.04
Category 5 (most deprived)	1.08	1.02	1.14	0.01
LLC
No	Ref
Yes	2.59	2.47	2.71	<0.001
Diagnostic group (reason for PICU admission)
Neurological	1.17	1.11	1.24	<0.001
Cardiac	0.86	0.81	0.90	<0.001
Respiratory	Ref
Oncology	1.83	1.70	1.97	<0.001
Infection	0.87	0.80	0.94	0.001
Musculoskeletal	0.91	0.81	1.03	0.152
Gastrointestinal	1.04	0.97	1.12	0.276
Other	1.04	0.96	1.13	0.339
Blood and lymph	0.98	0.82	1.17	0.79
Trauma	0.63	0.53	0.77	<0.001
Endocrine/metabolic	1.08	0.98	1.20	0.117
Multisystem	0.97	0.70	1.33	0.831
Body wall and cavities	0.63	0.54	0.72	<0.001
Risk of mortality (PIM2)
<1%	Ref
1% to <5%	1.28	1.22	1.35	<0.001
5% to <15%	1.55	1.45	1.64	<0.001
15% to <30%	2.07	1.88	2.28	<0.001
>30%	2.46	2.12	2.85	<0.001
LOS PICU (days)
<1	1.14	1.08	1.19	<0.001
1 to <3	Ref
3 to <7	1.06	1.01	1.12	0.01
7 to <14	1.29	1.22	1.37	<0.001
14 to <28	1.58	1.47	1.71	<0.001
>28	1.75	1.57	1.95	<0.001
Type of PICU admission
Planned, after surgery	Ref
Unplanned, after surgery	1.22	1.12	1.33	<0.001
Planned other	1.65	1.54	1.78	<0.001
Unplanned	1.37	1.29	1.44	<0.001
Not known	1.17	0.76	1.78	0.48
Year of admission	0.97	0.96	0.98	<0.001

n=91 614.
HR, hazard ratio; LLC, life-limiting condition; LOS, length of stay; PICU, paediatric intensive care unit; PIM2, Paediatric Index of Mortality 2.