Table 2.

The accuracy of ICD9, HITEx and the combinations of ICD9 and HITEx for principal diagnosis and co-morbidity extraction.

		ICD9 (Sens/Spec)	HITEx (Sens/Spec)	ICD9 and HITEx (Sens/Spec)	ICD9 or HITEx (Sens/Spec)
Exclude Insufficient Data	Principal	72.52%/90.91%	76.69%/86.99%	56.39%/96.75%	92.42%/80.99%
	Co-morbidity	14.81%/91.12%	70.37%/88.79%	11.11%/98.60%	74.07%/81.31%
Insufficient Data = Yes	Principal	60.22%/90.91%	63.93%/86.99%	45.90%/96.75%	78.02%/80.99%
	Co-morbidity	11.11%/90.53%	39.68%/87.24%	04.76%/98.77%	46.03%/37.86%
Insufficient Data = No	Principal	72.52%/85.38%	76.69%/82.08%	56.39%/92.49%	92.42%/74.85%
	Co-morbidity	11.11%/90.32%	66.67%/86.38%	07.41%/98.57%	70.37%/78.14%