Returns
For the sake of simplicity, the numbers presented include twins who completed part but not all of each study (hence provided at least some useful data), not just those who completed the entire study.
The table includes some numbers for twin pairs and some for individual twins, as shown.
| Original TEDS sample | 13945 | |
|---|---|---|
| TEDS26 twin study | Twin pairs contacted | 10328 |
| Unpaired twins contacted | 306 | |
| Pairs where both twins returned data (not always complete) | 3301 | |
| Pairs where one twin returned data (not always complete) | 2566 | |
| Percentage of twin pairs returning paired data | 32.0% | |
| Total individual twins contacted | 20962 | |
| Total individuals returning data | 9168 | |
| Percentage individuals returning data | 43.7% | |
| CATSLife twin study | Twin pairs contacted | 6834 |
| Unpaired twins contacted | 1345 | |
| Pairs where both twins returned data (not always complete) | 1483 | |
| Pairs where one twin returned data (not always complete) | 1802 | |
| Percentage of twin pairs returning paired data | 21.7% | |
| Total individual twins contacted | 15013 | |
| Total individuals returning data | 4768 | |
| Percentage individuals returning data | 31.8% | |