As Mahalanobis distance is calculated using normalized values, trend movement toward subset mean values (Z–B<0) was assumed to be related to clinical improvement, where a significant trend drifting ≥2 SDs from both the subset mean values, as well as the baseline, was deemed to result from instability (Z–B≥+2SD).
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Continuous Data-Driven Monitoring in Critical Congenital Heart Disease: Clinical Deterioration Model Development.
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