An impairment in the clarity of consciousness.
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Objective: To test whether duration of subsyndromal delirium is independently associated with institutionalization.
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Background: The prognostic importance of subsyndromal delirium is unknown.
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Subsyndromal delirium was considered present if the assessment was negative but the patient exhibited any CAM-ICU features.
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Conclusions: Subsyndromal delirium occurred in most critically ill patients, and its duration was an independent predictor of institutionalization.