Table 3 Intra-observer agreement for image quality evaluations of the lumbar spine
| Agreement | Expected Agreement | Kappa (k) | Standard Error | Z | Probability >Z | |
|---|---|---|---|---|---|---|
| Observer A | ||||||
| AP/PA | 86.00% | 66.32% | 0.5843 | 0.1350 | 4.33 | 0.0000 |
| Lat. L1-L4 | 86.00% | 49.52% | 0.7227 | 0.1359 | 5.32 | 0.0000 |
| Lat. L5-S1 | 90.00% | 65.24% | 0.7123 | 0.1352 | 5.27 | 0.0000 |
| Observer B | ||||||
| AP/PA | 86.00% | 62.00% | 0.6316 | 0.1358 | 4.65 | 0.0000 |
| Lat. L1-L4 | 88.00% | 51.20% | 0.7541 | 0.1370 | 5.50 | 0.0000 |
| Lat. L5-S1 | 84.00% | 55.72% | 0.6387 | 0.1356 | 4.71 | 0.0000 |