Table 2.

Number needed to diagnose by sign

Sign	Diagnosis	SensitivitySpecificity Y	NND = 1/Y
Attended alone	No cognitive impairment	0.93	0.45	0.38	2.63
Attended alone	No dementia	1.00	0.45	0.45	2.22
Attended with	Any cognitive impairment	0.93	0.47	0.40	2.50
Head turning	Any cognitive impairment	0.65	0.95	0.60	1.67
Applause	Any cognitive impairment	0.36	0.89	0.25	4.00
Applause	Dementia	0.54	0.85	0.39	2.56
La maladie du petit papier	No cognitive impairment	0.07	0.98	0.05	20.0

Y, Youden index; NND, number needed to diagnose.