Hospital-level associations with 30-day patient mortality after cardiac surgery: a tutorial on the application and interpretation of marginal and multilevel logistic regression

Table 2 Total number of cardiac surgeries, median of the annual number of cardiac surgeries, number of deaths within 30-days of surgery, and mortality rates in 18 hospitals 2001-2009 by academic affiliation status

Hospital	The median annual number of cardiac surgeries	No. of surgeries*	No. of deaths	Mortality rate (%)
Teaching
1	310	1174	37	3.15
2	163	326	10	3.07
3	195	780	8	1.03
4	147	294	6	2.04
5	147	470	17	3.62
6	293	1083	44	4.06
7	209	418	8	1.91
8	512	4361	176	4.04
9	437	3729	123	3.30
10	418	3291	129	3.92
11	284	1131	27	2.39
12	332	2753	93	3.38
13	402	3206	106	3.31
14	649	5314	97	1.83
15	324	1291	28	2.17
Non-teaching
16	475	1723	47	2.73
17	75	151	4	2.65
18	172	859	23	2.68