Table 2.

Calculation of the optimal cutoff levels for detecting anxiety based on receiver operating curve analysis.

Scale	Clinical correspondence	Cutoff	Sensitivity	Specificity	AUC	p value
Total score of PAS	Any anxiety disorders	12.5	88.6%	79.9%	0.847	p < 0.001
Persistent anxiety subscale	Generalized anxiety disorder	9.5	89.3%	81.2%	0.875	p < 0.001
Episodic anxiety subscale	Panic disorder	4.5	92.1%	81.5%	0.921	p < 0.001
Avoidant anxiety subscale	Avoidant anxiety disorders	3.5	78.4%	82.4%	0.835	p < 0.001

Anxiety disorders characterized by avoidance are agoraphobia and social phobia (here taken together as avoidant anxiety disorders). ROC = receiver operating characteristics; AUC = area under the curve; PAS = Parkinson Anxiety Scale.