Preliminary evaluation of a smartphone application (DelApp) for identification of delirium in sub-Saharan Africa.

In this setting, the DelApp performed well in identifying delirium and major cognitive impairment but did not differentiate delirium and dementia. Performance is likely to have been affected by confounders including uncorrected visual impairment and reduced level of arousal without delirium. Negative predictive value was nevertheless high, indicating excellent "rule out" value in this setting.