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Table 1 Reliability and Percentage of Floor and Ceiling Effects for Control Group Child Self-Report and Parent Proxy-Report on PedsQL™*

From: The comparison of perceived health-related quality of life between Australian children with severe specific language impairment to age and gender-matched peers

Scale

Cronbach’s Internal Consistency Reliability Coefficient Alpha

Floor Effecta

Ceiling Effectb

Child Self-Report

 Total Summary Score

0.80

  

 Psychosocial Health Summary Score

0.79

  

  Physical Functioning

0.86

0

37

  Emotional Functioning

0.85

0

9

  Social Functioning

0.83

0

56

  School Functioning

0.89

0

30

Parent Proxy-Report

 Total Summary Score

0.78

  

 Psychosocial Health Summary Score

0.76

  

  Physical Functioning

0.88

0

12

  Emotional Functioning

0.82

0

5

  Social Functioning

0.81

0

35

  School Functioning

0.85

0

14

  1. *The Pediatric Quality of Life Inventory™ Version 4.0 Generic Core Scales
  2. aThe percentage of participants that achieved the minimum possible score of 0
  3. bThe percentage of participants that achieved the maximum possible score of 100