Table 3.
Participant Disposition by Study Visit, and Completeness of Data Collection for Selected Major Outcomes
| Participant Disposition | Major Outcomes: Proportion non-missing, % | |||||||
|---|---|---|---|---|---|---|---|---|
| Visit/Method | Potential Interviews* (N) | Completed Interviews N (%)† | Refused or Unobtainable** (N) | Deaths# (N) | Drop-Outs# | GCP | ADL | IADL |
| 1 Month; In-Person | 566 | 556 (98) | 2 | 1 | 7 | 99.6 | 99.8 | 99.8 |
| 2 Month; In-Person | 558 | 543 (97) | 10 | 1 | 4 | 99.4 | 99.8 | 99.8 |
| 4 Month; Phone | 553 | 537 (97) | 10 | 3 | 3 | -- | -- | -- |
| 6 Month; In-Person | 547 | 537 (98) | 10 | 0 | 0 | 99.2 | 99.6 | 99.6 |
| 9 Month; Phone | 547 | 521 (95) | 19 | 3 | 4 | -- | -- | -- |
| 12 Month; In-Person | 540 | 517 (96) | 23 | 0 | 0 | 99.5 | 100 | 100 |
| 15 Month; Phone | 540 | 502 (93) | 32 | 3 | 3 | -- | -- | -- |
| 18 Month; In-Person | 534 | 508 (95) | 26 | 0 | 0 | 99.4 | 99.7 | 99.8 |
Note. Each row describes participants available (eligible) for interview. Reasons for dropout include: time commitment, gatekeeper preference, health status changes, declining memory.
GCP = General Cognitive Composite; ADL = Activities of Daily Living; IADL = Instrumental Activities of Daily Living
Eligible defined as all enrolled participants (N=566) minus those who have died or dropped out in the prior time periods
Proportion (%) complete defined as the ratio of interviews completed to those potentially available for interview at the relevant visit
Those refusing interview may be available at later timepoints
Lost to death or follow-up (will not contribute to later timepoints)