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Table 7 Bivariate Correlations Between the ISI, the PSQI and Psychological Functioning among Male and Female Adult Workers

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*** .27*** .21*** .28*** .10* .13** .25*** .36***
 Awakenings -.18*** .52*** .46*** .45*** .18*** .05 .37*** .47***
 Sleep duration (h) -.20*** -.20*** -.20*** -.27*** -.04 -.02 -.23*** -.25***
 MR: Sleep quality .48*** .65*** .56*** .69*** .28*** .18*** .65*** .74***
 MR: Restoration .40*** .47*** .39*** .56*** .36*** .23*** .53*** .61***
 MR: Mood .31*** .30*** .22*** .37*** .33*** .21*** .35*** .42***
 DR: Sleepiness .32*** .36*** .34*** .45*** .40*** .27*** .45*** .53***
 DR: Concentration .37*** .42*** .44*** .43*** .39*** .22*** .45*** .56***
 ER: Sleepiness -.07 .12* .17** .06 .06 .08 .10* .11*
 ER: Mood .26*** .25*** .25*** .29*** .17*** .07 .31*** .33***
Psychological functioning        
 SF12 -.27*** -.35*** -.35*** -.37*** -.25*** -.20*** -.42*** -.46***
Females Item 1 Item 2 Item 3 Item 4 Item 5 Item 6 Item 7 Total
Sleep         
 SOL (min) .28** .22* .21* .34*** .06 .07 .32*** .31***
 Awakenings .34*** .63*** .36*** .55*** .16 .03 .48*** .54***
 Sleep duration (h) -.25** -.27** -.18* -.10 .04 .04 -.11 -.18*
 MR: Sleep quality .50*** .63*** .47*** .74*** .35*** .13 .73*** .75***
 MR: Restoration .37*** .44*** .31*** .62*** .29*** .20* .58*** .59***
 MR: Mood .29** .23* .27** .38*** .24** .14 .34*** .39***
 DR: Sleepiness .28** .44*** .31*** .46*** .36*** .11 .53*** .52***
 DR: Concentration .13 .23* .31* .33*** .36*** .15 .33 .36***
 ER: Sleepiness .13 .01 .08 .01 .13 .12 .06 .05
 ER: Mood .23** .25** .30** .34*** .17 .06 .33*** .33***
Psychological functioning        
 SF12 -.22* -.35* -.30** -.45*** -.27** -.07 -.41*** -.43***
  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