Prospective Study of Different Diagnostic Criteria for Catatonia and Delirium in Internal Medicine and Neurology Admissions.

Exploratory factor analysis identified three Bush-Francis Catatonia Rating Scale factors, with immobility/stupor, mutism, and staring loading together onto the first factor.

However, exploratory factor analysis explained only 48% of the variance, possibly attributable to catatonia symptom overlap with other conditions.

Exploratory factor analysis supported akinesia as a core catatonia feature.

Few correlations were observed between Bush-Francis Catatonia Rating Scale and DRS-R-98 items, notably excitement with psychosis and motor agitation, as well as mitgehen with items representing the three core delirium domains and psychosis.