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Participant reported problems of using biofeedback device (n=24).
| Reported problems | Responses, n (%) |
| Finger sensor errors | 5 (21) |
| Difficulty using while stressed | 5 (21) |
| Lack of practice | 4 (16) |
| Device functions difficult | 3 (13) |
| Needed reminders | 3 (13) |
| Didn’t find it helped | 2 (8) |
| Ear sensor difficulty | 2 (8) |
