Table 7.
Standard error of measurement (SEM), minimal detectable change (MDC), minimal clinically important difference (MCID), effect size (ES) and standardized response mean (SRM) of the Functional Shoulder Score (FSS) for various score ranges and overall score.
| FSS pre-operatively |
All patients | |||
|---|---|---|---|---|
| 0 to 19 (n = 39) | 20 to 39 (n = 51) | 40 to 59 (n = 24)* | ||
| SEM | 4.78 | 4.15 | 7.47 | 7.85 |
| MDC | 5.06 | 4.48 | 8.05 | 8.38 |
| ES | 10.85 | 9.31 | 3.14 | 3.06 |
| SRM | 5.31 | 3.67 | 3.25 | 2.80 |
| MCID† | 29.2 ± 4.4 (n = 14) | 22.5 ± 4.4 (n = 10) | – | 24.7 ± 5.4 (n = 24) |
*Excluded five patients with pre-operative score > 60.
†Calculated only for those patients who reported becoming ‘better’ on the improvement scale.
SEM and MDC were calculated based on a 90% confidence interval.