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Table 6 Internal consistency reliability of the Malay version of SAQLI

From: Validity and reliability of the Malay version of sleep apnea quality of life index – preliminary results

Domain/item Corrected item-total correlation Cronbach’s alpha if item deleted Cronbach’s alpha for domain
Daily functioning (18 items) 0.978
  A1 0.885 0.977  
  A2 0.782 0.978  
  A3 0.869 0.977  
  A4 0.854 0.977  
  A5 0.859 0.977  
  A6 0.856 0.977  
  A7 0.852 0.977  
  A8 0.794 0.978  
  A9 0.760 0.978  
  A10 0.795 0.978  
  A11 0.916 0.976  
  B5 0.752 0.978  
  B7 0.882 0.977  
  D1 0.869 0.977  
  D2 0.861 0.977  
  D3 0.838 0.977  
  D4 0.852 0.977  
  D5 0.793 0.978  
Social interactions (13 items) 0.980
  B1 0.802 0.979  
  B2 0.837 0.979  
  B3 0.917 0.977  
  B4 0.917 0.977  
  B6 0.919 0.977  
  B8 0.914 0.977  
  B9 0.914 0.977  
  B10 0.938 0.977  
  B11 0.916 0.977  
  B12 0.892 0.978  
  B13 0.913 0.977  
  C1 0.797 0.980  
  C6 0.778 0.980  
Emotional functioning (9 items) 0.947
  C2 0.794 0.940  
  C3 0.886 0.935  
  C4 0.913 0.933  
  C5 0.887 0.935  
  C7 0.851 0.937  
  C8 0.890 0.935  
  C9 0.776 0.941  
  C10 0.551 0.951  
  C11 0.538 0.952  
Total scale    0.987