Table 1.

Cohort complication rates

	Preimplementation	Postimplementation	P
Number of procedures	219	184
Number of patients	212	180
Total number of complications	33	5
Complication rate per 100 patients	15.1	2.72	<.0001
Proportion of patients with 1 or more complications	11.40%	2.72%	.0006