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| Oxygen | Control | |
| n = 126 | n = 121 | |
| Participant completed it on his/her own | 45 (35) | 42 (35) |
| Completed with help from a relative/friend | 18 (14) | 21 (17) |
| Completed by a relative/friend | 25 (20) | 37 (31) |
| Completed by the researcher via phone, notes, clinic, ward | 24 (20) | 11 (9) |
| Question not answered | 14 (11) | 10 (8) |
Data are number (%). Only survivors are included.
