Table 1 Patient (P1–P6) characteristics and self-reported assessment. Roman numerals represent number of years spent in education: < 12 years for I; 12 years for II; > 12 years for III. For FSMC, BFS, and ISI, bold denotes severe, bold italics denotes moderate, and italics denotes mild symptoms. For HAD, fDAS, PCL-5, ESS, sQOD-NS, QOLIBRI, and SF-36, bold denotes abnormal and italics denotes near-normal scores. F, female; M, male
| Â | P1 | P2 | P3 | P4 | P5 | P6 |
|---|---|---|---|---|---|---|
Age (years) | 53 | 57 | 61 | 61 | 67 | 71 |
Sex (F/M) | F | M | F | M | M | M |
Education level (I–III) | III | II | III | II | II | II |
Duration (days) of mechanical ventilation/intensive care unit stay/acute hospitalization/postacute inpatient rehabilitation | 18/21/40/53 | 17/21/29/14 | 11/12/24/0 | 50/67/82/37 | 17/21/29/31 | 21/31/42/52 |
Fatigue scales | ||||||
Fatigue Scale for Motor and Cognitive Functions (FSMC) | Â | Â | Â | Â | Â | Â |
 Motor 10–50 | 29 | 23 | 31 | 34 | 34 | 22 |
 Cognitive 10–50 | 33 | 22 | 33 | 31 | 32 | 22 |
Brugmann Fatigue Scale (BFS) | Â | Â | Â | Â | Â | Â |
 Physical 0–12 | 5 | 0 | 4 | 5 | 5 | 3 |
 Mental 0–12 | 5 | 2 | 5 | 3 | 5 | 2 |
Visual analogue scale for situational mental fatigue (VAS-SMF) | Â | Â | Â | Â | Â | Â |
 Before cognitive testing 0–10 | 0 | 1.8 | 0.4 | 2 | 2.5 | 0.2 |
 After cognitive testing 0–10 | 1.7 | 4.2 | 9.7 | 6.6 | 8.5 | 1.2 |
Visual analogue scale for perceived mental effort (VAS-PME) | Â | Â | Â | Â | Â | Â |
 0–10 | 6.1 | 2.1 | 9.2 | 5 | 5.1 | 4.1 |
Psychiatric, neurobehavioral, and somatic questionnaires and scales | ||||||
Hospital Anxiety and Depression (HAD) scale | Â | Â | Â | Â | Â | Â |
 Anxiety 0–21 | 5 | 6 | 2 | 1 | 9 | 3 |
 Depression 0–21 | 6 | 1 | 2 | 2 | 1 | 3 |
French Dimensional Apathy Scale (f-DAS) | Â | Â | Â | Â | Â | Â |
 Executive 0–24 | 12 | 1 | 12 | 1 | 6 | 0 |
 Emotion 0–24 | 3 | 2 | 3 | 3 | 3 | 3 |
 Initiative 0–24 | 9 | 3 | 8 | 5 | 8 | 5 |
DSM-5 post-traumatic stress disorder (PTSD) checklist (PCL-5) | Â | Â | Â | Â | Â | Â |
 0–80 | 14 | 6 | 9 | 1 | 8 | 3 |
Epworth Sleepiness Scale (ESS) | Â | Â | Â | Â | Â | Â |
 0–24 | 10 | 2 | 2 | 7 | 10 | 9 |
Insomnia Severity Index (ISI) | Â | Â | Â | Â | Â | Â |
 0–28 | 12 | 5 | 1 | 3 | 8 | 7 |
Visual analogue scale for dyspnoea (VAS-D) | Â | Â | Â | Â | Â | Â |
 0–10 | 0 | 0 | 3 | 7 | 7 | 3 |
Visual analogue scale for muscle weakness (VAS-MW) | Â | Â | Â | Â | Â | Â |
 0–10 | 0 | 0 | 0 | 6 | 2 | 5 |
Visual analogue scale for olfactory disorders (VAS-OD) | Â | Â | Â | Â | Â | Â |
 0–10 | 0 | 0 | 0 | 0 | 0 | 9 |
Short version of the Questionnaire of Olfactory Disorders—Negative Statements (sQOD-NS) |  |  |  |  |  |  |
 0–21 | 21 | 21 | 21 | 21 | 21 | 19 |
Quality of Life after Brain Injury questionnaire (QOLIBRI) | Â | Â | Â | Â | Â | Â |
 0–100 | 80 | 93 | 78 | 77 | 80 | 86 |
Health-related quality of life (SF-36) | Â | Â | Â | Â | Â | Â |
 Physical functioning 0–100 | 75 | 95 | 60 | 75 | 80 | 75 |
 Physical role functioning 0–100 | 100 | 100 | 100 | 0 | 100 | 0 |
 Bodily pain 0–100 | 100 | 100 | 78 | 78 | 80 | 100 |
 General health perceptions 0–100 | 75 | 70 | 70 | 65 | 60 | 90 |
 Vitality 0–100 | 40 | 85 | 55 | 55 | 60 | 80 |
 Social role functioning 0–100 | 75 | 100 | 100 | 63 | 100 | 75 |
 Emotional role functioning 0–100 | 33 | 100 | 100 | 100 | 33 | 100 |
 Mental health 0–100 | 72 | 76 | 80 | 84 | 68 | 92 |
The Post-COVID-19 Functional Status (PCFS) scale | Â | Â | Â | Â | Â | Â |
 Before (0–4) | 0 | 0 | 0 | 0 | 1 | 1 |
 After (0–4) | 1 | 1 | 1 | 2 | 2 | 2 |