. Author manuscript; available in PMC: 2014 Aug 28.

Published in final edited form as: JAMA. 2013 Aug 28;310(8):812–820. doi: 10.1001/jama.2013.276205

Table 2.

Rate of Common Duct Injury in Cholecystectomies Performed With and Without Intraoperative Cholangiography Based on the Hospital’s Frequency of Intraoperative Cholangiography Use

Hospital IOC Use Quartile, %^a	No. of Patients	Rate of Common Duct Injury, No. (%) [95% CI]			P Value^b	Bonferroni Adjusted P Value^b
Hospital IOC Use Quartile, %^a	No. of Patients	Overall	Without IOC	With IOC	P Value^b	Bonferroni Adjusted P Value^b
<11.6	17 869	53 (0.30) [0.22–0.38]	42 (0.25) [0.18–0.33]	11 (0.96) [0.39–1.52]	<.001	<.001
11.6 to <28.8	23 150	66 (0.29) [0.22–0.35]	53 (0.27) [0.20–0.35]	13 (0.34) [0.16–0.53]	.47	>.99
28.8 to <67.8	24 479	92 (0.38) [0.30–0.45]	63 (0.46) [0.35–0.57]	29 (0.27) [0.17–0.37]	.02	.06
≥67.8	27 434	69 (0.25) [0.19–0.31]	43 (0.76) [0.54–0.99]	26 (0.12) [0.07–0.17]	<.001	<.001
All	92 932	280 (0.30) [0.27–0.34]	201 (0.36) [0.31–0.41]	79 (0.21) [0.17–0.26]	<.001

Abbreviation: IOC, intraoperative cholangiography.

Statistical significance of overall rates across hospital intraoperative cholangiography quartiles: P = .07.

Statistical significance of differences between cholecystectomies performed without and with intraoperative cholangiography for each strata of percentage of hospital intraoperative cholangiography use.