Table 2.

Psychosis evaluation.

	z-Score
NMSS (perceptual problems/hallucinations)	1.67
PS (frequency visual)	0.89
PS (frequency olfactory)	−0.45
PS (frequency auditory)	−0.77
PS (frequency presence)	−0.04
PS (delusion assessment)	−0.69
PS (duration of psychosis)	−0.73
PS (absence of insight)	−1.06
PS (threatening)	−0.57
PS (interaction)	−0.87
PS (family concern)	0.07
PS total	−0.67

NMSS z-score refers to the Italian normative data, whereas PS sub-scores and total z-score refer to normative data of non-Italian PD patients with psychosis. Positive z-score represents more severe symptoms.

NMSS, non-motor symptoms scale; PS, psychosis scale.