Table 3.
The interrater agreement
| Reading | ICC (95% CI)* | SEM (95% CI) | SDC |
|---|---|---|---|
| Reading 1 | |||
| SS | 0.84 (0.68–0.92) | 4.2 (3.2–6.3) | 12 |
| PI | 0.78 (0.63–0.88) | 5.9 (4.6–8.0) | 16 |
| TK | 0.82 (0.69–0.90) | 4.9 (3.8–6.7) | 14 |
| SVA | 0.99 (0.98–0.99) | 5.0 (4.4–5.8) | 14 |
| PT | 0.92 (0.86–0.95) | 2.5 (2.1–3.0) | 7 |
| Reading 2 | |||
| SS | 0.86 (0.73–0.92) | 4.3 (3.2–5.9) | 12 |
| PI | 0.80 (0.68–0.88) | 6.2 (5.2–7.8) | 17 |
| TK | 0.85 (0.74–0.91) | 4.7 (3.8–6.1) | 13 |
| SVA | 0.99 (0.99–1.00) | 4.6 (4.0–5.4) | 13 |
| PT | 0.86 (0.79–0.92) | 3.2 (2.8–3.8) | 9 |
ICC, intraclass correlation coefficient; CI, confidence interval; SEM, standard error of measurement; SDC, smallest detectable change; SS, sacral slope; PI, pelvic incidence; TK, thoracic kyphosis T4–T12; SVA, sagittal vertical axis; PT, pelvic tilt.
*
ICC calculated by 2-way-random effects model with absolute agreement.