Table 1

Word and phrase counts per inpatient were searched across all inpatient records along groups of similar semantics and linked to whether there was an associated date of death

	Key phrases showing up in documents from Octber 2018 to September 2019 (identical to ElasticSearch query)	Any inpatients with the phrase during time period in health record	Any inpatients with the phrase and death dates within 7 days	% of inpatients with phrase and death within 7 days	Relative risk versus annual control
Ceiling of Care Group	“Treatment Escalation Plan”	3181	55	1.7	2.16
	“not for inotropes”	20	<10	15.0	18.71
	“not for hdu”	39	<10	17.9	22.33
	“currently for full”	83	17	20.5	25.55
	“ceiling of rx” OR “ceiling of care” OR “ceilings of care” OR “ceilings of treatment” OR “ceiling of treatment”	1254	203	16.2	20.20
	“ceiling of care” OR “ceilings of care” OR “limit of care” OR “limits of care”	910	169	18.6	23.17
	“ceilings of treatment” OR “ceilings of treatment” OR “ceiling of rx”	431	54	12.5	15.63
	“not for intubation” OR “not suitable for intubation” OR “not appropriate for intubation”	184	51	27.7	34.58
	“not for itu” OR “not for icu” OR “not suitable for itu” OR “not appropriate for itu” OR “not for escalation to itu” OR “not for critical care”	284	99	34.9	43.49
	“ward based ceiling of care” OR “'ward based care only”	140	53	37.9	47.23
	“not for escalation” OR “escalation beyond”	193	75	38.9	48.48
	“unsurvivable”	59	34	57.6	71.89
End of Life Care Group	“palliative treatments only” OR “palliative input” OR “palliative medications” OR “palliation”	1165	390	33.5	41.76
	“withdrawal of care” OR “withdrawal of treatment” OR “withdrawal of intensive”	67	38	56.7	70.75
	“terminal care” OR “end of life care” OR “eol care” OR “eolc”	2138	1230	57.5	71.77
Control	None of the above phrases in either cluster	424 905	3406	0.8	–

Relative risk is derived from these absolute values.