Table 3. Between-day intra-rater reliability for isometric shoulder strength measurement.
| ICC1, 2 | Bland-Altman analysis | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Mean (95% CI) | SEM (SEM%) | MDC95 (MDC%) | Mean (LOA)(N) | 95% CI(N) | Fixed bias | Regression | p value | Proportional bias | ||
| Extensor | ||||||||||
| Examiner 1 | ||||||||||
| Dominant | 0.884 (0.615 to 0.966) | 5.7 (6.8) | 15.7 (18.8) | 4.4 (−16.0 to 24.8) | −2.2 to 11.1 | No | 0.322 | 0.307 | No | |
| Non-dominant | 0.917 (0.725 to 0.976) | 3.8 (5.0) | 10.5 (13.9) | −0.5 (−15.7 to 14.7) | −5.4 to 4.4 | No | −0.192 | 0.551 | No | |
| Examiner 2 | ||||||||||
| Dominant | 0.772 (0.242 to 0.933) | 7.1 (8.6) | 19.7 (23.9) | 4.7 (−20.1 to 29.5) | −3.3 to 12.8 | No | 0.149 | 0.644 | No | |
| Non-dominant | 0.847 (0.491 to 0.955) | 5.2 (7.0) | 14.5 (19.5) | 5.4 (−11.6 to 22.4) | −0.1 to 10.9 | No | −0.147 | 0.647 | No | |
| Internal rotator | ||||||||||
| Examiner 1 | ||||||||||
| Dominant | 0.944 (0.814 to 0.984) | 5.6 (7.1) | 15.6 (19.8) | −1.2 (−24.0 to 21.6) | −8.6 to 6.2 | No | 0.59 | 0.043 | Yes | |
| Non-dominant | 0.953 (0.843 to 0.986) | 3.8 (5.6) | 10.5 (15.6) | −1.3 (−16.6 to 14.0) | −6.2 to 3.7 | No | 0.156 | 0.628 | No | |
| Examiner 2 | ||||||||||
| Dominant | 0.960 (0.868 to 0.988) | 4.7 (5.8) | 13.0 (16.2) | 6.1 (−8.3 to 20.5) | 1.5 to 10.8 | Yes | 0.345 | 0.273 | No | |
| Non-dominant | 0.957 (0.858 to 0.988) | 3.9 (5.7) | 10.7 (15.8) | 4.1 (−9.3 to 17.5) | −0.2 to 8.5 | No | 0.228 | 0.477 | No | |
ICC: intraclass correlation coefficient; CI: confidence interval; SEM: standard error of measurement; MDC95: 95% confidence interval of minimal detectable change