The Single Question in Delirium (SQiD) is a proxy-based or informant-based delirium screen.
The rater asks a family member or caregiver “Has the patient been more confused lately?” Based upon the likelihood ratios, a positive response slightly to moderately increases the likelihood of delirium, while a negative response moderately reduces the likelihood of delirium.
One major disadvantage of the SQiD is that proxies are absent for 40% of older ED patients. Additional validation data are needed to better characterize the SQiD’s diagnostic performance in older ED patients.
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ED, emergency department
LR, likelihood ratio
RA, research assistant
SQiD, Single Question in Delirium