Table 1

Unadjusted analysis of death rates by patient and consultant characteristics for patients having elective surgery in 163 NHS hospitals during financial years 2008–2010

Characteristics	Procedures, N (total=3 922 091)	30-day death rate, % (total=26 409)	p Value
Patient
Gender			<0.0001
Male	1 847 153	0.83
Female	2 074 938	0.53
Age group (years)			<0.0001
<20	347 305	0.13
20–29	233 044	0.10
30–39	322 869	0.12
40–49	511 656	0.24
50–59	597 732	0.46
60–69	813 712	0.74
≥70	1 095 773	1.40
Ethnicity			<0.0001
White	3 247 986	0.70
Others	674 105	0.54
Charlson Index			<0.0001
0	2 832 986	0.29
1–3	213 058	0.54
4–6	417 367	0.61
≥7	432 271	3.27
Deprivation Index			<0.0001
1 (least deprived)	7 410 308	0.64
2	829 801	0.69
3	817 793	0.68
4	779 474	0.68
5 (most deprived)	731 275	0.67
6 (unknown)	22 440	0.75
Procedure risk quintile			<0.0001
0 (least risk)	768 632	0.03
1	794 626	0.12
2	771 030	0.25
3	803 025	0.50
4	784 778	2.45
Previous admissions			<0.0001
0	3 013 210	0.43
1–2	786 456	1.31
≥3	122 425	2.62
Method of admission			<0.0001
From waiting list	2 294 298	0.46
Booked	1 236 354	0.73
Planned	391 439	1.73
Day of procedure			<0.0001
Monday	724 541	0.55
Tuesday	816 465	0.62
Wednesday	799 260	0.67
Thursday	786 919	0.70
Friday	628 681	0.83
Saturday	124 672	0.73
Sunday	49 505	0.81
Year of discharge			0.4289
2008	1 333 018	0.67
2009	1 317 100	0.68
2010	1 271 973	0.67
Consultant*
Seniority (N)			0.067
Junior (5 580)	495 670	0.70
Mid (8 375)	1 776 009	0.67
Senior (7 241)	1 650 412	0.67

*Total number of consultants for the study period is 21 196.