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

From: Validation of the German version of the insomnia severity index in adolescents, young adults and adult workers: results from three cross-sectional studies

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***
  1. Bold and bold italic coefficients are discussed in the text. Item 1 = Difficulty falling asleep; Item 2 = Difficulty staying asleep; Item 3 = Waking up too early; Item 4 = How satisfied are you with your current sleep pattern?; Item 5 = To what extent do you consider your sleep problem to interfere with your daily functioning (e.g., daytime fatigue, ability to function at work/daily chores, concentration, memory, mood, etc.)?; Item 6 = How noticeable to others do you think your sleeping problem is in terms of impairing the quality of your life?; Item 7 = How worried/distressed are you about your current sleep problem? MR morning rating, DR daytime rating, ER evening rating
  2. *p < .05, **p < .01, ***p < .001