. 2018 Nov 20;10:375. doi: 10.3389/fnagi.2018.00375

Table 4.

Correlation between subjective sleep quality, sleepiness, depressive symptoms, and actigraphic parameters.

	PSQI_Total	PSQI_Quality	PSQI_Latency	PSQI_Duration	PSQI_Efficiency	PSQI_Disturbance	PSQI_Medication	PSQI_{Day Disfunction}	Epworth	GDS	Actigraphy_{Bed Time}	Actigraphy_{Wake Time}	Actigraphy_Latency	Actigraphy_Efficiency	Actigraphy_TTB	Actigraphy_TST	Actigraphy_WASO	Actigraphy_#Awkenings
PSQI_total
PSQI_Quality	0.811^***
PSQI_Latency	0.827^***	0.712^**
PSQI_Duration	0.624^***	0.499^**	0.401^*
PSQI_Efficiency	0.686^***	0.573^**	0.700^**	0.513^**
PSQI_Disturbance	0.582^***	0.485^**	0.549^**	0.217	0.277
PSQI_Medication	0.550^***	0.388^*	0.264	0.275	0.393^*	0.297
PSQI_{Day Disfunction}	0.580^***	0.294	0.294	0.292	0.117	0.473^**	0.529^**
Epworth	−0.065	−0.051	−0.090	−0.118	−0.034	0.278	0.063	0.248
GDS	0.477^***	0.391^*	0.356^*	0.201	0.480^**	0.267	0.675^***	0.357^*	0.142
Actigraphy_BedTime	−0.117	0.126	−0.272	0.160	−0.281	−0.211	−0.175	−0.126	−0.046	−0.408^*
Actigraphy_WakeTime	0.238	0.321	0.276	−0.060	0.387^*	0.115	0.094	0.105	0.282	0.127	0.097
Actigraphy_Latency	−0.075	−0.095	−0.110	−0.166	−0.039	0.064	0.025	0.013	0.232	0.188	−0.249	0.190
Actigraphy_Efficiency	0.123	0.105	0.117	0.098	0.043	0.125	0.175	0.035	−0.483^**	0.064	0.004	−0.252	−0.589^**
Actigraphy_TTB	0.382^*	0.202	0.495^**	−0.129	0.583^***	0.289	0.324	0.202	0.220	0.466^**	−0.688^***	0.574^***	0.307	−0.204
Actigraphy_TST	0.432^*	0.241	0.498^**	−0.070	0.597^***	0.347	0.456^**	0.277	0.150	0.589^***	−0.688^***	0.462^**	0.081	0.142	0.912^***
Actigraphy_WASO	0.105	0.065	0.142	−0.063	0.275	0.053	0.003	0.092	0.550^***	0.152	−0.219	0.535^***	0.547^**	−0.886^***	0.572^***	0.269
Actigraphy_#Awkenings	0.230	0.236	0.188	0.199	0.319	0.077	0.082	0.100	0.277	0.122	−0.161	0.395^*	0.508^**	−0.638^***	0.455^*	0.194	0.721^***
Actigraphy_{AvgTAwkenings}	−0.068	−0.177	0.034	−0.243	0.055	−0.065	−0.068	−0.064	0.352	0.096	−0.312	0.097	0.029	−0.458^**	0.323	0.236	0.500^**	−0.133

Statistic used: Spearman's rho;

Correlation is significant at the 0.05 level (2-tailed);

^**

Correlation is significant at the 0.01 level (2-tailed);

^***

Correlation is significant at the 0.003 level (Bonferroni correction)

PSQI, Pittsburgh Sleep Quality Index; Epworth, Epworth Sleepiness Scale; GDS, Geriatric Depression Scale.

Actigraphy: Bed Time, time participant went to bed; Wake Time, time participant got up; TTB (Total Time in Bed), total amount of time spent in bed; TST (Total Sleep Time), number of minutes scored as sleep during time-in-bed; Latency, number of minutes from lights out until the first epoch of recorded sleep; Efficiency, calculated as (TST/TTB) × 100; WASO (Wake After Sleep Onset), number of minutes scored as wake after sleep onset; #Awakenings, total number of transitions to wake from sleep; Avg T Awakenings, average time of each transitions to wake from sleep.

Bold used to highlight all values of p within the different statistical significant thresholds.