Table 1

Patient cohort characteristics

	Acute myocardial infarction		Urgent bowel surgery		Elective bowel surgery		Hip replacement
	N	%	N	%	N	%	N	%
Sex
Male	39 887	66	1637	52	9856	58	21 206	40
Female	20 299	34	1490	48	7245	42	31 532	60
Age group (years)
<54	11 017	18	471	15	1849	11	6651	13
55–64	12 504	21	533	17	3567	21	10 622	20
65–74	13 935	23	801	26	5757	34	18 345	35
75–84	14 029	23	951	30	4839	28	14 437	27
>85	8701	14	371	12	1089	6	2683	5
Charlson score
0	24 299	40	1037	33	8286	48	34 203	65
1	9448	16	203	6	1739	10	4776	9
2	10 597	18	307	10	2174	13	8135	15
3	6483	11	166	5	951	6	3238	6
4+	9359	16	1414	45	3951	23	2386	5
IMD quintiles
1 (least deprived)	13 148	22	551	18	2489	15	7203	14
2	12 273	21	591	19	2975	18	9222	18
3	12 129	20	678	22	3699	22	11 380	22
4	11 621	20	684	22	3959	23	12 326	24
5 (most deprived)	10 258	17	588	19	3815	23	11 811	23
Admission in previous year	13 470	22	980	31	4020	24	5221	10
Direct indicator of harm present during the hospital spell	8348	14	1080	35	4479	26	5317	10
Total	60 186		3127		17 101		52 738

Hospital Episode Statistics data ©2017, reused with the permission of the Health & Social Care Information Centre. All rights reserved.
IMD, Index of Multiple Deprivation.