|
Permanently
|
178
|
|
(79.5%)
|
|
Specific number of years
|
10
|
|
(4.5%)
|
|
Something else b
|
36
|
|
(16.0%)
|
- a Missing data deleted listwise.
- b Specific examples: “indefinitely;” “mixed model among contributing investigators;” “generally permanently, but the answer is specific to each protocol;” “indefinitely or until the biobank closes;” “until samples are depleted”.