Table 3.

Item analysis for the family caregiver ICU delirium knowledge questionnaire

Item number	Description	Alpha if item deleted	Item-to-total score correlations
1	Patients with an infection	0.78	0.54
2	Patients who are married (vs not married)	0.80	0.33
3	Patients with dementia	0.78	0.54
4	Patients who are older	0.78	0.56
5	Patients with more than a high school education	0.79	0.37
6	Patients who had recent surgery	0.78	0.61
7	Patients who are dehydrated	0.77	0.70
8	Patients experiencing change in surroundings such as a recent ICU admission or move to new room or transferred	0.77	0.69
9	Patients started on a new medication	0.78	0.51
10	Patients who are mechanically ventilated or intubated	0.79	0.48
11	Orient patient to time and day or bring in photos from home	0.79	0.38
12	Wait 24 h to see if the patient got better	0.79	0.40
13	Let the patient sleep during the day to recover	0.80	0.33
14	Do nothing	0.79	0.32
15	Inform the bedside RN or another member of the care team right away	0.79	0.39
a16	Ask the care team about medication changes	0.80	0.23
17	Patient slowly becomes more confused over a few months (prior to ICU admission), is forgetful, has trouble paying attention, and is more confused later in the day	0.80	0.30
a18	Patient slowly becomes more confused over a few months (prior to ICU admission), is forgetful, has trouble paying attention and later in the day sees things that are not there	0.80	0.23
19	While in the ICU, the patient suddenly becomes confused over a few days or hours, floats in and out of confusion during the day, has trouble paying attention, sees things that are not there	0.78	0.56
20	While in the ICU, the patient suddenly becomes confused over a few days or hours, has trouble paying attention, and sleeps more during the day	0.78	0.49
21	While in the ICU, the patient becomes more confused over a few days and suddenly has trouble getting to the bathroom on time	0.79	0.43

^aItems with low correlation and can be removed from the CIDKQ