Ruling Out Brain CT Contraindications prior to Intravenous Thrombolysis: Diagnostic Equivalence between a Primary Interpretation Workstation and a Mobile Tablet Computer
Table 1
Comparison of the distribution of the type of stroke classification between the reading systems.
Lesion type
Reading system
Detected cases
Proportion (%
Std. error
95% Wald confidence
Wald chi-square
value
Lower
Upper
Without lesion
Medical-IMPAX
214
29.5
0.032
0.23
0.36
2.024
0.155
Tablet-XERO
229
31.5
0.032
0.25
0.38
Hemorrhagic lesion
Medical-IMPAX
64
8.8
0.025
0.04
0.14
1.690
0.194
Tablet-XERO
69
9.5
0.025
0.05
0.14
Acute ischemic lesion
Medical-IMPAX
346
47.7
0.035
0.41
0.54
11.051
0.001
Tablet-XERO
306
42.1
0.035
0.35
0.49
Chronic ischemic lesion
Medical-IMPAX
102
14.0
0.022
0.10
0.18
6.183
0.013
Tablet-XERO
122
16.8
0.024
0.12
0.22
Overall ischemic
Medical-IMPAX
448
61.7
0.036
0.55
0.69
3.428
0.064
Tablet-XERO
428
59.0
0.035
0.52
0.66
proportion was calculated from 726 readings (121 cases by 6 radiologists). Statistics were evaluated using generalized estimating equations (GEE) analysis. The overall Wald chi-square was 0.941 with a significance of 0.332. ischemic lesion was calculated as the aggregate values of acute and chronic ischemic lesions.
