Table 3.

Pearson item-total correlation coefficients of the ICDSC (n = 77 patients; 507 test occasions)

ICDSC items	Corrected item-total correlations	Total alpha if item is deleted
Item 1 “Altered level of consciousness”	0.638	0.811
Item 2 “Inattention”	0.586	0.819
Item 3 “Disorientation”	0.588	0.819
Item 4 “Hallucination, delusion, psychosis”	0.507	0.829
Item 5 “Psychomotor agitation or retardation”	0.661	0.808
Item 6 “Inappropriate speech or mood”	0.575	0.822
Item 7 “Sleep/wake cycle disturbance”	0.469	0.837
Item 8 “Symptom fluctuation”	0.604	0.816