Clinical Features and Correlates of Poor Nighttime Sleepiness in Patients with Parkinson’s Disease

Table 4

Regression analysis of factors associated with the PSQI global score of PD-PNS patients.

Independent variable	Unstandardized regression coefficient (B)	Standard error (SE)	Standardized regression coefficient (β)	t value	value
Constant term	15.564	2.566	—	6.065	≤0.001
H&Y	4.146	0.908	0.743	4.566	≤0.001
UPDRS-III	0.148	0.035	0.656	4.209	≤0.001
RLS	2.562	1.267	0.208	2.022	0.049
HAMD	0.552	0.131	0.553	4.205	≤0.001

R² = 0.577; final model, adjusted R² = 0.541. PSQI: Pittsburgh sleep quality index; PD-PNS: Parkinson’s disease with poor nighttime sleep; H&Y: Hoehn–Yahr stage; UPDRS III: united Parkinson’s disease ranking scale part III; RLS: restless legs syndrome; HAMD: Hamilton’s depression scale.