Table 2.

Estimated and actual numbers of incontinence procedures at Ontario hospitals performing both surgeries during the study interval 1993–2006, presented for the 10 highest volume RP sites

Site	RP	Actual AUS/sling	Expected AUS/sling	Z-score	p value
1	3007	112	144.34	−2.064	0.0390
2	1827	1	87.70	−9.320	<0.0001
3	1302	185	62.50	8.185	<0.0001
4	1191	9	57.17	−6.010	<0.0001
5	890	7	42.72	−5.138	<0.0001
6	815	22	39.12	−2.232	.0256
7	720	2	34.56	−5.455	<0.0001
8	536	14	25.73	−1.896	.0579
9	466	9	22.37	−2.428	.0152
10	461	4	22.13	−3.598	.0003

AUS: artificial urinary sphincter; RP: radical prostatectomy.