When comparing models, a difference of AIC less than 2 is generally considered insignificant, a difference of AIC between 2 and 4 moderately significant, and a difference greater than 4 is considered a strong evidence of performance improvement with the model with the lowest AIC ( 31 ).
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Variation in Arterial CO2 is a Stronger Determinant of Brain Tissue Oxygenation Than its Synchronous Value in Critically Ill Patients With Acute Brain Injury.
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