Table 3.

Univariable Correlation Analysis Between SKNA, HRV Parameters and Sleep Quality

	PSQI		Subjective Sleep Quality		Sleep Latency		Sleep Duration		Habitual Sleep Efficiency		Sleep Disturbances		Use of Sleep Medication		Daytime Dysfunction
	r	p	r	p	r	p	r	p	r	p	r	P	r	p	r	p
SKNA	−0.387	0.001	−0.307	0.008	−0.244	0.037	−0.295	0.011	−0.228	0.053	−0.339	0.003	−0.281	0.016	−0.288	0.014
SDNN	−0.341	0.003	−0.347	0.003	−0.22	0.062	−0.204	0.084	−0.252	0.032	−0.328	0.005	−0.204	0.083	−0.207	0.079
RMSSD	−0.26	0.027	−0.254	0.030	−0.117	0.326	−0.174	0.142	−0.227	0.054	−0.248	0.034	−0.174	0.141	−0.14	0.236
| AC |	−0.279	0.017	−0.139	0.242	−0.268	0.022	−0.262	0.025	−0.276	0.018	−0.154	0.193	−0.176	0.137	−0.109	0.357
DC	−0.268	0.022	−0.084	0.478	−0.245	0.037	−0.287	0.014	−0.306	0.009	−0.11	0.354	−0.206	0.081	−0.072	0.542
TP	−0.226	0.054	−0.27	0.021	−0.119	0.316	−0.081	0.493	−0.155	0.191	−0.279	0.017	−0.143	0.226	−0.153	0.197
LF	−0.236	0.044	−0.241	0.040	−0.143	0.228	−0.113	0.34	−0.151	0.202	−0.268	0.022	−0.188	0.111	−0.146	0.219
HF	−0.171	0.147	−0.231	0.049	−0.046	0.701	−0.014	0.91	−0.128	0.282	−0.263	0.024	−0.119	0.315	−0.134	0.259
LF/HF	0.066	0.577	−0.008	0.947	−0.019	0.87	0.112	0.347	0.105	0.379	−0.007	0.951	0.086	0.468	0.029	0.807
SD1	−0.26	0.027	−0.254	0.03	−0.117	0.326	−0.173	0.142	−0.227	0.054	−0.249	0.034	−0.174	0.141	−0.14	0.236
SD2	−0.337	0.004	−0.351	0.002	−0.228	0.053	−0.187	0.113	−0.235	0.046	−0.333	0.004	−0.194	0.099	−0.218	0.064
SD1/SD2	−0.004	0.972	0.06	0.615	0.055	0.642	−0.095	0.425	−0.067	0.573	0.061	0.608	−0.077	0.516	0.08	0.5
SampEn	0.151	0.204	0.304	0.009	0.089	0.456	0.094	0.427	−0.036	0.763	0.202	0.087	−0.014	0.907	0.157	0.185

Abbreviations: SKNA, skin sympathetic nerve activity; HRV, heart rate variability; |AC|, absolute value of acceleration capacity.