Table 2.
DWI values | Overall agreement rate | Kappa statistic | 95% CI | |||
---|---|---|---|---|---|---|
High | Normal | |||||
ASL-CBF values (N = 10) |
Hypoperfusion | 37 (6.0%) |
58 (9.4%) |
81.8% | 0.29 | 0.19–0.39 |
Normal | 55 (8.9%) |
490 (75.8%) |
||||
SPECT values (N = 8) |
Hypoperfusion | 30 (6.0%) |
40 (8.1%) |
85.2% | 0.37 | 0.25–0.48 |
Normal | 33 (6.7%) |
393 (79.2%) |
||||
PET values (N = 3) |
Low accumulation | 11 (5.9%) |
25 (13.4%) |
78.5% | 0.23 | 0.06–0.40 |
Normal | 15 (8.1%) |
135 (72.6%) |
Cohen’s kappa coefficient with a 95% confidence interval (CI) was derived based on the overall agreement rates. ASL, arterial spin labeling; CBF, cerebral blood flow; CI, confidence interval; CJD, Creutzfeldt–Jacob disease; DWI, diffusion–weighted image; PET, positron emission tomography; SPECT, single-photon emission computed tomography.