Table 1.

Counts of patients by hospital, general or regional anesthesia, and pair type. Type 1 pairs finely balanced hospitals, while type 2 pairs contrast hospitals with different usual practices.

	Finely Balanced (type 1)		Usual Practice (type 2)
Hospital	General	Regional	General	Regional
1	77	77	0	11
2	8	8	0	102
3	101	101	0	4
4	10	10	0	52
5	30	30	0	2
6	3	3	0	163
7	42	42	3	0
8	18	18	0	66
9	48	48	0	10
10	14	14	0	54
11	34	34	0	22
12	25	25	20	0
13	27	27	48	0
14	30	30	0	17
15	16	16	0	44
16	19	19	0	32
17	10	10	0	16
18	21	21	45	0
19	32	32	13	0
20	19	19	0	38
21	5	5	0	87
22	17	17	0	16
23	1	1	0	0
24	29	29	0	14
25	14	14	0	41
26	17	17	71	0
27	35	35	168	0
28	92	92	0	0
29	34	34	11	0
30	11	11	19	0
31	16	16	0	60
32	10	10	42	0
33	39	39	11	0
34	0	0	63	0
35	33	33	0	8
36	27	27	25	0
37	4	4	135	0
38	123	123	11	0
39	13	13	23	0
40	44	44	0	5
41	18	18	0	68
42	9	9	27	0
43	47	47	21	0
44	73	73	0	4
45	22	22	97	0
46	33	33	91	0
47	4	4	0	8