The quality of denominator data in surgical site infection surveillance versus administrative data in Norway 2005–2010

Table 2 Accuracy: the number of procedures by type of surgical procedure and year and proportion of the procedures in NOIS versus NPR for selected hospitals and reporting months, 2005–2010

	2005	2006	2007	2008	2009	2010	Total
CABG¹
NOIS	167	402	519	580	503	520	2691
NPR	237	446	589	709	514	554	3049
Accuracy	70.5 %	90.1 %	88.1 %	81.8 %	97.9 %	93.9 %	88.3 %
CSEC
NOIS	883	1304	1607	1826	2051	2402	10,073
NPR	904	1346	1660	2014	2065	2431	10,420
Accuracy	97.7 %	96.9 %	96.8 %	90.7 %	99.3 %	98.8 %	96.7 %
HPRO
NOIS	903	1052	1338	1853	2151	2335	9632
NPR	943	1087	1451	1959	2194	2363	9997
Accuracy	95.8 %	96.8 %	92.2 %	94.6 %	98.0 %	98.8 %	96.3 %
CHOL¹
NOIS	159	234	339	341	405	524	2002
NPR	194	274	359	395	464	582	2268
Accuracy	82.0 %	85.4 %	94.4 %	86.3 %	87.3 %	90.0 %	88.3 %
TOTAL accuracy	92.7 %	94.9 %	93.7 %	90.6 %	97.6 %	97.5 %	94.8 %

NOIS: Norwegian Surveillance System for Antibiotic Consumption and Healthcare-Associated Infections
NPR: Norwegian Patient Register
¹Mixed procedures excluded from NOIS for CABG in 2008 and for CHOL in 2007 and 2008

ISSN: 1471-2334