Summary of the univariate Cox proportional hazards for regaining walking ability of all potential predictor variables
| Variable (at T0) | χ2 | p Value | HR | 95% CI |
|---|---|---|---|---|
| Age (years) | 7.37 | 0.007 | 0.970 | 0.949 to 0.992 |
| BMI | 3.92 | 0.048 | 0.972 | 0.944 to 1.000 |
| Sex (male) | 0.00 | 0.996 | 1.001 | 0.637 to 1.573 |
| Duration of illness (days) | 1.33 | 0.249 | 0.995 | 0.986 to 1.004 |
| Number of medical tubes (catheters and vascular access) | 1.83 | 0.176 | 0.901 | 0.774 to 1.048 |
| Duration of mechanical ventilation (days) | 8.05 | 0.005 | 0.992 | 0.986 to 0.997 |
| Number of secondary diagnoses | 0.07 | 0.790 | 0.996 | 0.965 to 1.03 |
| ERBI item 1: intensive care supervision | 1.37 | 0.242 | 1.009 | 0.994 to 1.023 |
| ERBI item 2: tracheostomy tube management and supervision | 0.41 | 0.524 | 1.005 | 0.990 to 1.019 |
| ERBI item 3: intermittent or continuous mechanical ventilation | 0.00 | 0.986 | 1.000 | 0.987 to 1.014 |
| ERBI item 4: confused patient (in need of supervision) | 2.14 | 0.144 | 1.023 | 0.992 to 1.055 |
| ERBI item 5: behavioural disturbances (patient being a danger to himself or others) | 2.37 | 0.124 | 0.984 | 0.965 to 1.004 |
| ERBI item 6: severe impairment of communication | 11.24 | 0.001 | 1.037 | 1.015 to 1.060 |
| ERBI item 7: patient with dysphagia in need of supervision | 2.43 | 0.119 | 0.993 | 0.983 to 1.002 |
| Ability to reach forward (cm) | 4.06 | 0.044 | 1.028 | 1.001 to 1.056 |
| FSS-ICU score (points) | 1.99 | 0.159 | 1.062 | 0.977 to 1.115 |
| PFIT-s (points) | 0.51 | 0.475 | 1.095 | 0.854 to 1.403 |
| Grip strength (kg) | 3.03 | 0.082 | 1.075 | 0.991 to 1.167 |
| MRC sum score upper limb (points) | 8.44 | 0.004 | 0.715 | 0.571 to 0.897 |
| MRC sum score lower limb (points) | 0.00 | 0.970 | 1.004 | 0.808 to 1.248 |
| VAS (mm) | 0.43 | 0.514 | 1.012 | 0.977 to 1.047 |
| MoCA (points) | 1.34 | 0.247 | 0.960 | 0.896 to 1.029 |
| CDT (points) | 1.23 | 0.267 | 0.847 | 0.632 to 1.136 |
BMI, body mass index; CDT, clock drawing test; ERBI, Early Rehabilitation Barthel Index; FSS-ICU, Functional Status Score for the intensive care unit; MoCA, Montreal Cognitive Assessment; MRC, Medical Research Council; PFIT-s, Physical Function ICU test (scored); VAS, visual analogue scale.