Table 3.
Subgroup recovery models
| Subgroup (n) | Model formula | Model parameters (95 % CI) | ||
|---|---|---|---|---|
| Initial deficit I | Recovery rate β | Chronic deficit c | ||
| Fast (5) | m = I + βt | −0.9 (0.3, −2.4) | 0.005 (0.002,0.007) | – |
| Slow (15) | m = I*exp(−βt) | −5.9 (−2.8, −10.2) | 0.023 (0.011,0.045) | – |
| Impaired (8) | m = I*exp(−βt) + c | −23.4 (−9.5, −45.6) | 0.031 (0.045,0.076) | −5.5 (−8.3, −3.4) |
The dependent variable m in each model represents motor performance (in z-scores, i.e. units standard deviation of healthy control behaviour), the independent variable t represents time in days (starting from the day of stroke) and c chronic deficit. Consequently, units for I and c are z-scores and units for β are day−1. A negative score in I and c indicates lower performance compared to healthy controls (normal performance: z = 0 ± 2.5). As per definition, fast and slow recovery subgroups exhibit no chronic deficit