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Table 1 Validity of potential indicators for lung and colorectal cancer compared with the NSW Cancer Registry, February 2006 to December 2010

From: Identifying incident colorectal and lung cancer cases in health service utilisation databases in Australia: a validation study

Source Colorectal cancer (No. cases in NSWCR: 2253) Lung cancer (No. cases in NSWCR: 1019)
No. cases identified PPV Sensitivity Specificity No. cases identified PPV Sensitivity Specificity
Individual indicators
 APDC diagnosis of cancer 2338 91% 95% 99.9% 968 85% 81% 100.0%
 APDC diagnosis of history of primary cancer 2487 24% 26% 99.5% 166 23% 4% 100.0%
 APDC surgical resection 3376 54% 81% 99.4% 400 60% 23% 99.9%
 APDC chemotherapy 1333 12% 7% 99.6% 1333 6% 7% 99.5%
 APDC radiotherapy 456 4% 1% 99.8% 456 14% 6% 99.9%
 EDDC diagnosis of primary cancer 27 44% 1% 100.0% 56 50% 3% 100.0%
 MBS surgical resection 1793 59% 47% 99.7% 310 45% 14% 99.9%
 MBS radiotherapy item 6051 3% 9% 97.8% 6051 5% 33% 97.9%
 MBS chemotherapy item 4940 12% 27% 98.4% 4940 7% 35% 98.3%
 PBS chemotherapy drug item 1663 46% 34% 99.7% 2082 14% 28% 99.3%
 COD-URF death record with primary cancer type 364 36% 6% 99.9% 609 62% 37% 100.0%
Combinations of indicators
 APDC cancer diagnosis or history of cancer 3254 65% 94% 99.6% 1016 81% 81% 99.9%
 APDC cancer diagnosis or surgery 3738 57% 95% 99.4% 1119 74% 81% 99.9%
 APDC cancer diagnosis and surgery 1933 94% 80% 100.0% 246 96% 23% 100.0%
 APDC cancer diagnosis and APDC chemotherapy or radiotherapy 201 83% 7% 100.0% 145 83% 12% 100.0%
 APDC or EDDC diagnosis of primary cancer 2345 91% 95% 99.9% 980 84% 81% 100.0%
 MBS or PBS chemotherapy or radiotherapy 9144 9% 38% 96.9% 9178 5% 49% 96.8%
 APDC cancer diagnosis and MBS/PBS chemotherapy or radiotherapy 963 86% 37% 100.0% 526 79% 41% 100.0%
 APDC cancer diagnosis and COD-URF primary cancer 242 52% 6% 100.0% 483 71% 34% 100.0%
 APDC cancer diagnosis or COD-URF primary cancer 2370 90% 95% 99.9% 1042 83% 84% 99.9%
  1. APDC Admitted Patient Data Collection, COD-URF Cause Of Death Unit Record File, EDDC Emergency Department Data Collection, MBS Medicare Benefits Schedule, NSWCR New South Wales Cancer Registry, PBS Pharmaceutical Benefits Scheme, PPV Positive predictive value