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

Table 3

Correlation coefficients of the PSQI global score and PSQI components with other factors in PD-PNS patients.

	PSQI global score	Subjective sleep	Sleep latency	Sleep duration	Sleep efficiency	Sleep disturbance	Sleep medication	Daytime dysfunction
Age	0.045	0.02	0.119	−0.061	−0.061	−0.009	0.098	0.121
Sex	0.094	0.193	0.280	−0.074	0.110	0.082	0.165	−0.058
BMI	0.216	0.136	0.081	0.177	0.267	0.161	0.171	0.204
Age (m)	0.146	0.250	0.078	0.226	0.229	0.203	0.131	0.247
LED (mg)	−0.001	0.148	0.192	0.110	0.158	0.208	0.015	0.132
H&Y (on)	0.223	0.246	0.214	0.110	0.121	0.338	−0.032	0.322
UPDRS I	0.501	0.517	0.302	0.552	0.480	0.511	−0.072	0.509
UPDRS III	0.425	0.306	0.367	0.202	0.251	0.363	−0.022	0.265
ESS	−0.296	−0.363	−0.174	−0.335	−0.368	−0.407	−0.171	−0.384
RBD	0.227	0.153	0.219	0.188	0.213	0.380	0.032	0.159
RLS	0.254	0.145	0.064	0.132	0.108	0.134	0.047	0.465
HAMD	0.466	0.497	0.416	0.442	0.480	0.380	0.085	0.432
HAMA	0.329	0.355	0.351	0.346	0.311	0.378	0.118	0.336

BMI: body mass index; LED: daily levodopa-equivalent dose; H&Y: Hoehn–Yahr stage; UPDRS-I: united Parkinson’s disease ranking scale part-I; UPDRS III: united Parkinson’s disease ranking scale part- III; PSQI: Pittsburgh sleep quality index; ESS: Epworth sleepiness scale; RBD: rapid eye movement (REM) sleep behavior disorder; RLS: restless legs syndrome; HAMA: Hamilton’s anxiety scale; HAMD: Hamilton’s depression scale; ; .