Table 1.
Response Rates to the 2004–2008 Follow-up Survey of The Hempelmann Cohort by Thymic Irradiation Status
| Response Status | Total, n (%) (N = 7490)a |
Irradiated, n (%) (N = 2657)a |
Non-Irradiated Siblings, n (%) (N = 4833)a |
|---|---|---|---|
| Deceased | 857 (11.4)b | 345 (13.0) b | 512 (10.6) b |
| Not known to be deceased | 6633 (88.6) | 2312 (87.0) | 4321 (89.4) |
| Total Surveys Mailed | 6633 (100) | 2312 (100) | 4321 (100) |
| Responded (completed)c | 3071 (46.3) | 1303 (56.4) | 1768 (40.9) |
| Declinedc | 456 (6.9) | 107 (4.6) | 349 (8.1) |
| Did Not Respondc | 2457 (37.0) | 696 (30.1) | 1761 (40.7) |
| Undeliverablec,d | 648 (9.8) | 204 (8.8) | 444 (10.2) |
a From original study population, 199 irradiated and 220 non-irradiated siblings were excluded from the current cohort because they died before age 5 or were untraceable within 5 years after birth
b As a percentage of the entire cohort
c As a percentage of the cohort not known to be deceased. Columns may not sum to 100% as a result of rounding. The “did not respond” category may contain lost to follow-up individuals, because we included people who did not respond and whose survey packets were not returned by post office
d Contact information could not be confirmed, or survey returned by post office but the individual was not known to be deceased