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Table 2 Results of the principal component analysisab

From: Instrument completion and validation of the patient-reported apnea questionnaire (PRAQ)

Items Factor 1 Factor 2 Factor 3
During the past 4 weeks, did you have a problem with:
Fighting to stay awake during the day? .290 .727  
Suddenly falling asleep?   .836  
Difficulty staying awake during a conversation?   .636 .222
Difficulty staying awake while watching something? (concert, movie, television)   .858  
Falling asleep at inappropriate times or places?   .802  
Feeling very tired? .785   
Lacking energy? .856   
Still feeling tired when you wake up in the morning? .790   
In the past 4 weeks:
How difficult was it for you to do your most important daily activity? (such as your job, studying, caring for the children, housework) .841   
How often did you use all your energy on only your most important, daily activity? (such as your job, studying, caring for the children, housework) .940   
How often did you use all your energy to accomplish only your most important daily activity? (such as your job, studying, caring for the children, housework) .825   
How much difficulty did you have finding energy for your hobbies? .770   
How difficult was it for you to get your chores done? .849   
How often did you feel depressed or hopeless? .266   .677
How often did you feel anxious?    .793
How often did you lose your temper?    .803
How often did you feel that you could not cope with everyday life?    .746
How often did you feel irritated?    .889
How often did you have a strong emotional reaction to everyday events?    .875
  1. a. The bold font numbers indicate the highest factor loading for that item
  2. b. Absolute factor loadings < 0.2 are not shown in the table