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Table 2 Validation measures 1 for 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

From: Validation of colorectal cancer surgery data from administrative data sources

  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. 1 The width of the 95% confidence interval for estimates without a superscript are < 6%.
  2. 2 Width of the 95% confidence interval is 6 – 14%.
  3. 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.