Participant retention-related data in longitudinal studies of trauma ICU survivors
| Participant retention-related issue | Studies reporting, n (%) (N=11) |
| Study exclusion criteria included barrier(s) to follow-up (eg, homelessness) | 8 (72) |
| Sample size or power calculation | 0 (0) |
| Reported use of strategies to improve participant retention | 4 (36) |
| Mortality reported during follow-up | 8 (72) |
| Reported lost to follow-up rates combined with mortality | 2 (18) |
| Included flow diagram with retention rate for each follow-up time point | 5 (45) |
| Reported reasons for lost to follow-up at each follow-up time point | 4 (36) |
ICU, intensive care unit.