Participation in National Cancer Institute DES follow-up study
| . | DES exposed . | Unexposed . | ||
|---|---|---|---|---|
| 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 | 8 | 9 | ||
| 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 exposed . | Unexposed . | ||
|---|---|---|---|---|
| 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 | 8 | 9 | ||
| 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.