κ statistics for agreement (ranges of 4 observers) versus the ASPECTS of an unblinded 3-person concensus panel
| Reading 1 vs Panel | Reading 2 vs Panel | P* | |
|---|---|---|---|
| Acute hypoattenuation vs | |||
| ASPECTS < 9 | 0.07–0.27 | 0.20–0.41 | .01 |
| ASPECTS < 8 | 0.10–0.35 | 0.25–0.58 | .008 |
| ASPECTS < 7 | 0.22–0.51 | 0.42–0.45 | .14 |
Note:—NR indicates neuroradiologist; ASPECTS, Alberta Stroke Program Early CT Score.
* P value for change in agreement from reading 1 to reading 2.