Table 3

Odds ratios for Elixhauser and Dr Foster global frailty score after multivariable adjustment for age, gender and country

	Outcome	Score range	Population	OR	Lower CI	Upper CI	P value
Dr Foster global frailty score	In-hospital mortality	0–11	Elective	1.277	1.247	1.308	<0.001
	In-hospital mortality	0–13	Non-elective	1.109	1.103	1.116	<0.001
	30 day non-elective readmission	0–6	Elective	1.106	1.060	1.154	<0.001
	30 day non-elective readmission	0–4	Non-elective	1.056	1.031	1.082	<0.001
	Upper quartile length of stay (for country)	0–16	Elective	1.365	1.347	1.382	<0.001
	Upper quartile length of stay (for country)	0–17	Non-elective	1.199	1.194	1.205	<0.001
Elixhauser comorbidity score	In-hospital mortality		Elective	1.309	1.290	1.329	<0.001
	In-hospital mortality		Non-elective	1.130	1.126	1.133	<0.001
	30 day non-elective readmission		Elective	1.144	1.130	1.158	<0.001
	30 day non-elective readmission		Non-elective	1.045	1.042	1.048	<0.001
	Upper quartile length of stay (for country)		Elective	1.101	1.097	1.105	<0.001
	Upper quartile length of stay (for country)		Non-elective	1.069	1.068	1.071	<0.001