Table 1.

Reported prevalence of NPS in various phases of PD

NPS	Overall in PD (%)	Untreated premotor phase of PD (%)	Untreated motor phase of PD (%)
Apathy	17–50	24–50	12–30
Depression	35	24–68	28
Anxiety	34–65	13	16–25
ICD	8–43	No data	17–18
Psychosis	17–72	33	30
Sleep disturbances	75	17–52	59
Cognitive impairment	25–80	26–60	10–40

Abbreviations: ICD, impulse control disorder; NPS, neuropsychiatric symptoms; PD, Parkinson’s disease.