Table 2

Interobserver and intraobserver reproducibility of intracranial volume and infarct volume measurements

MeasurementMean (95% CI)
Intraobserver difference in ICV as % of mean ICV (observer 1)1.83  (0.99  to  2.67)
Intraobserver difference in ICV as % of mean ICV (observer 2)0.78 (0.53  to  1.03)
Intraobserver difference in infarct volume as % of mean infarct volume (observer 1)20.17 (12.59  to  27.66)
Intraobserver difference in infarct volume as % of mean infarct volume (observer 2)7.39 (5.29  to  9.49)
Interobserver difference in ICV as % of mean ICV1.96 (1.07  to  2.85)
Interobserver difference in infarct volume as % of mean infarct volume 22.02 (12.21  to  31.82)
Interobserver difference in %ICV infarcted as % of mean %ICV infarcted22.63 (12.99  to  32.26)
Interobserver difference in %ICV infarcted as % of mean %ICV infarcted for “small” lesions (⩽ 1.03%ICV)43.83 (18.73  to  68.93)
Interobserver difference in %ICV infarcted as % of mean %ICV infarcted for “moderate” lesions
(> 1.03 and ⩽ 5.29% ICV)
15.19 (7.86  to  22.52)
Interobserver difference in infarct volume as % of mean infarct volume for “large” lesions (> 5.29%ICV)8.28 (4.76  to  11.8)
  • CI, confidence interval; ICV, intracranial volume.