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Table 1.

Participation in National Cancer Institute DES follow-up study

DES exposedUnexposed
No. identified for the original cohorts 5,067 2,372 
Ineligible for National Cancer Institute study   
    Missing date of birth 21 15 
    Never located 56 154 
    Deceased before 1978 11 15 
    Lost or refused before 1978 154 106 
    Cancer before start of follow-up 
Total eligible for National Cancer Institute study 4,817 2,073 
    Died during follow-up 59 18 
    Responded to 1994 questionnaire 3,932 (82%) 1,735 (84%) 
    Responded to 1997 questionnaire 3,946 (82%) 1,722 (83%) 
    Responded to 2001 questionnaire* 3,812 (80%) 1,637 (80%) 
DES exposedUnexposed
No. identified for the original cohorts 5,067 2,372 
Ineligible for National Cancer Institute study   
    Missing date of birth 21 15 
    Never located 56 154 
    Deceased before 1978 11 15 
    Lost or refused before 1978 154 106 
    Cancer before start of follow-up 
Total eligible for National Cancer Institute study 4,817 2,073 
    Died during follow-up 59 18 
    Responded to 1994 questionnaire 3,932 (82%) 1,735 (84%) 
    Responded to 1997 questionnaire 3,946 (82%) 1,722 (83%) 
    Responded to 2001 questionnaire* 3,812 (80%) 1,637 (80%) 
*

Proportion of eligible subjects still alive in 2001.

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