Table 2.
Distribution of the study population by participant status (cases and controls) as of June 2014.
| Cases | Controls | Total | |
|---|---|---|---|
| Identified as eligible | 878 | 2112 | 2990 |
| Agreed to participate | 686 | 1275 | 1961 |
| Interviewed | 566 | 1074 | 1640 |
| Refused | 84 | 491 | 575 |
| Doctor refused; dead; too ill (no proxy available) | 11 | 0 | 11 |
| Other reason for non-participation | 10 | 13 | 23 |
| Unable to locate | 45 | 159 | 204 |
| Pending confirmation | 42 | 174 | 216 |
| Participation ratesa | 78–83% | 60–69% | 65–73% |
aThe ranges represent the worst and best case scenarios depending on response status; lower bound includes only current agreed, upper bound assumes all pending agree.