Table 2.

Validation measures¹for colorectal surgery in physician billing and hospital inpatient data compared to the Alberta Cancer Registry overall and by year of diagnosis, stage and tumor site

	Physician Billing Data					Hospital Inpatient Data					Combined Administrative Data
					Observed					Observed					Observed
Factors	Sens.	Spec.	PPV	NPV	Agreement	Sens.	Spec.	PPV	NPV	Agreement	Sens.	Spec.	PPV	NPV	Agreement
	%	%	%	%	%	%	%	%	%	%	%	%	%	%	%
All	97	72	95	79	93	94	80	96	72	92	97	68	95	79	93
Year
2000	97	692	95	772	93	96	832	97	752	94	97	642	95	792	93
2001	97	672	94	782	92	95	802	96	742	93	97	622	93	772	91
2002	97	702	95	772	93	95	772	96	702	92	97	652	95	782	92
2003	97	802	97	802	94	94	812	97	702	92	97	742	96	812	94
2004	97	742	95	832	93	94	832	96	762	92	97	722	94	842	93
2005	96	742	95	782	92	93	792	96	682	91	96	692	94	772	92
Stage
I	91	883	100	53	91	87	883	100	43	87	91	883	100	53	91
II	99	493	99	503	98	97	633	99	323	97	99	413	99	523	98
III	99	703	99	543	99	98	783	100	313	97	99	703	100	593	99
IV	99	692	82	98	87	97	79	87	94	89	99	642	80	98	85
Missing	88	822	862	842	85	852	862	89	822	85	88	782	842	842	84
Tumor Site
Colon	97	752	96	80	94	95	85	97	75	94	97	732	95	80	93
Rectal	96	692	94	782	92	93	732	95	672	90	97	602	93	782	91

¹ The width of the 95% confidence interval for estimates without a superscript are < 6%.

² Width of the 95% confidence interval is 6 – 14%.

³ Unstable estimate: width of 95% confidence interval is >14% and/or the width of the interval is >40% of the value of the estimate.