Ruling Out Brain CT Contraindications prior to Intravenous Thrombolysis: Diagnostic Equivalence between a Primary Interpretation Workstation and a Mobile Tablet Computer

Table 3

Comparison of diagnostic variables and reading time between the reading systems.

Reading system	Readings		Std. error	95% Wald confidence interval		Wald chi-	value
				Lower	Upper
ASPECTS ≤ 6
Medical-IMPAX	81/586	0.14	0.027	0.09	0.19	0.034	0.855
Tablet-XERO	84/593	0.14	0.026	0.09	0.19
Contraindication to the tPA administration for acute ischemic lesions
Medical-IMPAX	112/346	0.32	0.038	0.25	0.40	0.508	0.476
Tablet-XERO	105/306	0.34	0.039	0.27	0.42
Presence of HMCA
Medical-IMPAX	123/505	0.24	0.029	0.19	0.30	4.912	0.027
Tablet-XERO	141/492	0.29	0.034	0.22	0.35
Reading time
Medical-IMPAX	726	126.0	4.47	117.1	134.9	0.332	0.566
Tablet-XERO	726	122.5	5.28	112.0	132.9

ASPECTS = Alberta Stroke Early CT Scan score; HMCA = hyperdense middle cerebral artery; ASPECTS ≤ 6, presence of imaging contraindications to the tPA administration, and the presence of HMCA, the mean proportion was calculated from the detected cases on each variable over the number of readings. Statistics were obtained using generalized estimating equations (GEE) analysis; the reading time the statistic for ANOVA analysis was used.