Table 1

Sources and date of confirmation of cancer cases during the follow-up period from August 1991 to June 1995

SourcesAugust 1991 to July 1992July 1992 to December 1992January 1993 to December 1993January 1994 to June 1995Total
Cancer registry0610925
Death records00101
Telephone interview00303
Blackfoot disease registry00112
Total6151031