Table 3. Results of ROC curve analysis considering ability of functional tests to predict abnormal performance on a global cognitive test (MMSE and/or MDRS).

Functional test	AUC	Predicts at least one abnormal cognitive score if score is greater than	Sensitivity	Specificity	PPV	NPV
Pill test	0.668	0	0.80	0.58	0.55	0.84
Pill questionnaire	0.637	0	0.46	0.63	0.56	0.85
Telephone test	0.837	2	0.82	0.63	0.56	0.85
DAFA	0.761	4	0.90	0.53	0.57	0.90
PFAQ	0.661	2	0.23	0.748	0.42	0.60

AUC: Area Under the Curve, DAFA: Direct Assessment of Functional Abilities, MDRS: Mattis Dementia Rating Scale, MMSE: Mini-Mental State Examination, PFAQ: Pfeffer's Functional Activities Questionnaire, PPN: Positive predictive value, NPV: Negative predictive value