Table 5 Bivariate Correlations Between the ISI, the PSQI and Psychological Functioning among Male and Female Young Adults

Males

Item 1

Item 2

Item 3

Item 4

Item 5

Item 6

Item 7

Total

Sleep

 SOL (min)

.51***

.11

.02

.42***

.07

.08

.32***

.34***

 Awakenings

.34***

.57***

.35***

.41***

.15*

.04

.33***

.46***

 Sleep duration (h)

.13

-.06

-.04

.10

.09

.05

.10

.09

 MR: Sleep quality

.39***

.48***

.24***

.55***

.23**

.06

.48***

.54***

 MR: Restoration

.41***

.26***

.23**

.54***

.24**

.07

.43***

.49***

 MR: Mood

.13

.05

-.01

.18**

.08

.01

.18**

.14*

 DR: Sleepiness

.30***

.26***

.25***

.46***

.44***

.21**

.41***

.52***

 DR: Concentration

.36***

.29***

.29***

.47***

.43***

.10

.49***

.53***

 ER: Sleepiness

-.33***

-.03

-.01

-.30***

-.02

.02

-.21

-.19***

 ER: Mood

.12

.15*

.14*

.26***

.16*

.10

.24***

.26***

Psychological functioning

 Depression scale

.36***

.35***

.38***

.40***

.31***

.10

.43***

.50***

Females

Item 1

Item 2

Item 3

Item 4

Item 5

Item 6

Item 7

Total

Sleep

 SOL (min)

.53***

.25***

.13**

.43***

.15***

.10*

.40***

.44***

 Awakenings

.19***

.47***

.25***

.38***

.08

.11**

.25***

.38***

 Sleep duration (h)

.09***

-.08

-.03

.06

.00

-.03

-.02

.00

 MR: Sleep quality

.51***

.51***

.33***

.69***

.24***

.12**

.57***

.65***

 MR: Restoration

.46***

.38***

.22***

.54***

.25***

.14***

.53***

.56***

 MR: Mood

.26***

.18***

-.04

34***

.20***

.16***

.32***

.34***

 DR: Sleepiness

.35***

.31***

.21***

.41***

.27***

.13***

.45***

.47***

 DR: Concentration

.37***

.34***

.27***

.40***

.29***

.16***

.45***

.51***

 ER: Sleepiness

-.15***

.03

.02

-.09*

-.02

-.03

-.08

-.07

 ER: Mood

.25***

.17***

.13**

.23***

.04

.02

.21***

.23***

Psychological functioning

 Depression scale

.35***

.35***

.27***

.38***

.27***

.19***

.46***

.51***