Returns
The figures shown in the table below are numbers of families (twin pairs).
For the sake of simplicity, where data were collected on line, "completed" means that the online activities were finished - the numbers do not include cases where the online activities were started but not finished (data present but incomplete).
| Original TEDS sample | 13945 | |
|---|---|---|
| TEDS 21 Phase 1 parent study | Parents contacted | 10451 |
| Completed | 5352 | |
| Percentage completed | 51.2% | |
| TEDS 21 Phase 1 twin study | Twin pairs contacted | 10535 |
| Completed by both twins | 4128 | |
| Completed by one twin | 1443 | |
| Percentage completed: both twins | 39.2% | |
| Percentage completed: one twin only | 13.7% | |
| TEDS 21 Phase 2 twin study | Twin pairs contacted | 8611 |
| Completed by both twins | 3536 | |
| Completed by one twin | 1648 | |
| Percentage completed: both twins | 41.1% | |
| Percentage completed: one twin only | 19.1% | |
| TEDS 21 Phase 1 combined (parents and twins) |
Families contacted | 10577 |
| Completed by parent and both twins | 3664 | |
| Completed by parent and one twin | 694 | |
| Completed by both twins but not parent | 464 | |
| Completed by parent but neither twin | 994 | |
| Completed by one twin only | 749 | |
| TEDS 21 Phases 1 and 2 combined (twins, ignoring parents) |
Twin pairs contacted in both phases | 8535 |
| Completed by both twins in both phases | 3352 | |
| Percentage completed by both twins, both phases | 39.3% | |
| Phase 1 completed by both twins (phase 2 incomplete) | 776 | |
| Phase 2 completed by both twins (phase 1 incomplete) | 184 | |
| Completed by one twin only, either or both phases | 1525 | |
| G-game twin study | Twin pairs in which both twins contacted | 6685 |
| Twin pairs in which only one twin contacted | 1261 | |
| Total individual twins contacted | 14631 | |
| Completed by both twins | 1491 | |
| Percentage of twin pairs completed | 22.3% | |
| Completed by one twin | 1769 | |
| Total individual twins completed | 4751 | |
| Percentage of individual twins completed | 32.5% | |
| Covid Phase 1 twin study | Twin pairs in which both twins contacted | 6673 |
| Twin pairs in which only one twin contacted | 1272 | |
| Total individual twins contacted | 14618 | |
| Completed by both twins | 1494 | |
| Percentage of twin pairs completed | 22.4% | |
| Completed by one twin | 1931 | |
| Total individual twins completed | 4919 | |
| Percentage of individual twins completed | 33.7% | |
| Covid Phase 2 twin study | Twin pairs in which both twins contacted | 4061 |
| Twin pairs in which only one twin contacted | 277 | |
| Total individual twins contacted | 8399 | |
| Completed by both twins | 1228 | |
| Percentage of twin pairs completed | 30.2% | |
| Completed by one twin | 1608 | |
| Total individual twins completed | 4064 | |
| Percentage of individual twins completed | 48.4% | |
| Covid Phase 3 twin study | Twin pairs in which both twins contacted | 4068 |
| Twin pairs in which only one twin contacted | 275 | |
| Total individual twins contacted | 8411 | |
| Completed by both twins | 1100 | |
| Percentage of twin pairs completed | 27.0% | |
| Completed by one twin | 1471 | |
| Total individual twins completed | 3671 | |
| Percentage of individual twins completed | 43.6% | |
| Covid Phase 4 twin study | Twin pairs in which both twins contacted | 4059 |
| Twin pairs in which only one twin contacted | 284 | |
| Total individual twins contacted | 8402 | |
| Completed by both twins | 1150 | |
| Percentage of twin pairs completed | 28.3% | |
| Completed by one twin | 1596 | |
| Total individual twins completed | 3896 | |
| Percentage of individual twins completed | 46.4% | |
| Covid study across phases | Both twins invited in all 4 phases | 4026 |
| Completed by both twins in all 4 phases | 495 | |
| Completed by both twins across 2 or 3 phases | 893 | |
| Completed by both twins in 1 phase only | 791 | |