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Table 2 Bivariate correlations between the ISI, the PSQI and psychological functioning among male and female adolescents

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) .42*** .27*** .17*** .27*** .13** .08* .17*** .38***
 Awakenings .27*** .36*** .24*** .32*** .19*** .08* .24*** .34***
 Sleep duration (h) -.12** -.04 .01 -.13*** -.02 -.08* -.10** -.10**
 MR: Sleep quality .54*** .46*** .34*** .71*** .38*** .23*** .54*** .71***
 MR: Restoration .37*** .28*** .21*** .55*** .35*** .29*** .41*** .54***
 MR: Mood .26*** .24*** .15*** .38*** .30*** .27*** .22*** .40***
 DR: Sleepiness .33*** .28*** .15*** .37*** .35*** .26*** .31*** .45***
 DR: Concentration .34*** .33*** .34*** .48*** .36*** .26*** .38*** .55***
 ER: Sleepiness -.01 .07 -.03 .03 .16*** .09* .07 .08*
 ER: Mood .23*** .21*** .21*** .23*** .12** .09* .17*** .28***
Psychological functioning         
 KIDSCREEN -.30*** -.29*** -.23*** -.40*** -.23* -.11 -.32*** -.38***
Females Item 1 Item 2 Item 3 Item 4 Item 5 Item 6 Item 7 Total
Sleep         
 SOL (min) .47*** .27*** .22*** .40*** .19*** .09* .31*** .44***
 Awakenings .26*** .49*** .30*** .32*** .13*** .05 .28*** .41***
 Sleep duration (h) -.10* -.11** .04 -.18*** -.11** -.13*** -.08* -.17***
 MR: Sleep quality .60*** .58*** .41*** .74*** .26*** .22*** .49*** .74***
 MR: Restoration .47*** .38*** .22*** .58*** .37*** .27*** .40*** .60***
 MR: Mood .32*** .24*** .13** .31*** .32*** .33*** .22*** .41***
 DR: Sleepiness .37*** .36*** .23*** .39*** .43*** .32*** .35*** .54***
 DR: Concentration .37*** .35*** .28*** .44*** .33*** .23*** .37*** .53***
 ER: Sleepiness -.12** .01 .00 .00 .12** .15*** .05 .04
 ER: Mood .27*** .24*** .21*** .28*** .13*** .09** .21*** .33***
Psychological functioning         
 KIDSCREEN -.37*** -.36*** -.26*** -.44*** -.28*** -.25*** -.34*** -.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