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. Author manuscript; available in PMC: 2015 Sep 1.
Published in final edited form as: Ann Epidemiol. 2014 Jul 3;24(9):666–672.e2. doi: 10.1016/j.annepidem.2014.06.099

Table 2.

Accuracy of Stage Inferred from Medicare Claims to Identify Stage Reported in the SEER Data (Gold Standard)

SEER Historic Stage Stage Inferred from Metastasis Codes in Medicare Claims
N % Sensitivity Specificity PPV NPV
Cancer site Local Regional Distant Any metastases*
Breast Local 18,310 98.6 0.9 0.5 1.4 98.6 43.9 78.5 93.8
Regional 7,191 60.0 35.3 4.7 40.0 35.3 98.4 88.8 80.8
Distant 1,642 39.3 9.7 51.0 60.7 51.0 98.3 65.8 96.9
Any metastases* 8,833 56.1 30.5 13.3 43.9 43.9 98.6 93.8 78.5
Colorectal Local 11,213 96.8 1.0 2.2 3.2 96.8 55.0 65.0 95.2
Regional 9,213 55.0 34.0 11.0 45.0 34.0 97.6 89.7 70.6
Distant 3,790 20.6 6.6 72.8 79.4 72.8 93.8 68.5 94.9
Any metastases* 13,003 45.0 26.0 29.0 55.0 55.0 96.8 95.2 65.0
Lung Local 6,850 94.2 3.2 2.6 5.8 94.3 45.0 34.9 96.1
Regional 8,249 75.0 17.6 7.4 25.0 17.6 89.3 40.0 72.9
Distant 13,594 42.9 14.4 42.7 57.1 42.7 94.8 88.1 64.7
Any metastases* 21,843 55.0 15.6 29.3 45.0 45.0 94.3 96.1 34.9

Note: PPV = positive predictive value, NPV = negative predictive value;

*

Any metastases combines regional and distant stage.