Table 1

Ascertainment of colorectal cancer in Cornwall: comparison of data sources

No. cases corroborated from other data sources
Primary data sourceNo. cases identified% Total no. casesDocumentary sourcesHistopathologyCDC No. cases not corroborated
CDC, clinical data capture.
Documentary sources
No. cases21493.020317411
κ Score (primary data source v other sources)0.8780.540
No. pairs examined217227
Histopathology
No. cases20689.62031743
κ Score (primary data source v other sources)0.8780.609
No. pairs examined217219
CDC
No. cases18781.317420313
κ Score (primary data source v other sources)0.5400.609
No. pairs examined227219