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Table 3 Component analysis with Varimax rotation of the RIS in 218 insomnia patients

From: Regensburg Insomnia Scale (RIS): a new short rating scale for the assessment of psychological symptoms and sleep in insomnia; Study design: development and validation of a new short self-rating scale in a sample of 218 patients suffering from insomnia and 94 healthy controls

RIS Items I II III IV Communalities
1. Sleep latency −.29 .70 .01 .33 0.68
2. Sleep duration .44 .69 −.10 −.08 0.69
3. Sleep continuity .81 .08 −.01 .04 0.66
4. Early awakening .79 −.04 .00 .02 0.63
5. Easy awakening .65 .10 −.14 −.08 0.47
6. Sleepless nights .19 .71 .26 −.27 0.68
7. Thinking about sleep .15 −.14 .90 .02 0.85
8. Fear of insomnia −.07 .42 .74 .13 0.75
9. Impaired daytime .03 .25 .04 −.73 0.61
10. Hypnotic intake .05 .29 .19 .67 0.58
Variance 20.56% 18.52% 14.95% 12.01%  
  1. Component I: Sleep depth, Component II: Sleep quantity, Component III: Fearfully focussing on insomnia and component IV: Sleep medication/daytime functioning.