THE CAPTURE-RECAPTURE METHOD FOR ESTIMATION OF CANCER REGISTRY COMPLETENESS - A USEFUL TOOL

Background. In this paper we investigated whether the capture-recaptur e method is useful for a cancer registry to monitor its completeness o f case ascertainment on a routine basis. Methods. The capture-recaptur e method was used to estimate the completeness of case ascertainment i n three regional cancer registries in the Netherlands, which are based on case finding by pathology laboratories and hospitals. Results. Com pleteness was estimated to be 98.3%. The estimate of completeness was dependent on age and cancer site, with lower estimates of completeness for skin cancer and lymphatic and haematopoietic malignancies and for the age group greater than or equal to 75 years. Conclusions. A major drawback of the capture-recapture method is its inability to estimate the number of cases that are not routinely notified to the registry b y one or both notification sources. Another limitation is the lack of statistical power to detect incompleteness in an early stage. It is co ncluded that the capture-recapture method is not useful for everyday s urveillance of completeness in cancer registration.