Baseline and change scores for exercise 1 and 2 for the two readers including reliability and sensitivity to change.
| Variables | Exercise 1 | Exercise 2 | Exercise 1 vs 2 | Exercise 2 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Baseline | Baseline | Baseline | Change Score Week 0–12 | ||||||||||||
| Score | Reliability | Score | Reliability | Reliability | Score | Reliability | Sensitivity to Change | ||||||||
| Scoring method and scan plane | Mean (SD) | Mean (SD) | ICC (interreader) | Mean (SD) | Mean (SD) | ICC (interreader) | ICC (intrareader) | Mean (SD) | Mean (SD) | ICC (interreader) | SDC | SDC-HOS (%) | SDC-HPS (%) | SDD | |
| Reader | 1 | 2 | 1 vs 2 | 1 | 2 | 1 vs 2 | 1 vs 1 | 2 vs 2 | 1 | 2 | 1 vs 2 | ||||
| Semicoronal | |||||||||||||||
| Berlin (0–24) | 3.2 (5.3) | 3.4 (5.8) | 0.97 | 2.8 (5.2) | 3.8 (5.9) | 0.92 | 0.96 | 0.97 | −1.2 (2.6) | −1.5 (3.1) | 0.87 | 1.4 | 5.9 | 5.9 | 2.9 |
| SPARCC (0–72) | 7.0 (11.9) | 7.4 (12.4) | 0.98 | 6.4 (12.0) | 8.8 (14.3) | 0.92 | 0.96 | 0.96 | −2.5 (6.7) | −3.6 (8.1) | 0.89 | 3.2 | 6.4 | 4.5 | 6.5 |
| Global (0–8) | 1.8 (2.5) | 1.9 (2.5) | 0.98 | 1.6 (2.3) | 2.1 (2.6) | 0.90 | 0.94 | 0.93 | −0.6 (1.3) | −0.6 (1.3) | 0.77 | 0.9 | 10.7 | 10.7 | 1.4 |
| Semiaxial | |||||||||||||||
| Berlin (0–24) | 2.2 (3.9) | 3.9 (5.4) | 0.79 | 2.8 (4.5) | 3.6 (5.8) | 0.88 | 0.95 | 0.93 | −1.0 (2.5) | −1.3 (2.8) | 0.50 | 2.6 | 12.4 | 10.9 | 3.4 |
| SPARCC (0–96) | 6.3 (12.1) | 8.0 (11.8) | 0.91 | 6.7 (11.4) | 8.0 (13.6) | 0.92 | 0.97 | 0.92 | −3.1 (7.3) | −2.8 (7.1) | 0.78 | 5.5 | 9.8 | 5.7 | 6.8 |
| Global (0–8) | 1.4 (2.2) | 2.2 (2.5) | 0.77 | 1.8 (2.2) | 1.9 (2.5) | 0.83 | 0.92 | 0.85 | −0.6 (1.4) | −0.5 (1.2) | 0.33 | 1.5 | 18.6 | 18.6 | 1.9 |
p < 0.0001 for interreader and intrareader ICC. All comparisons of baseline and change scores between reader 1 and 2 analyzed by independent t test were nonsignificant. ICC: intraclass correlation coefficient; SDC: smallest detectable change; SDC-HOS: SDC as a percentage of the highest observed score of the scoring method; SDC-HPS: SDC as a percentage of the highest possible score of the scoring method; SDD: smallest detectable difference; SPARCC: Spondyloarthritis Research Consortium of Canada.