Reliability and Validity

  • Created by: mutsa__
  • Created on: 24-01-17 12:42

Reliability in diagnosis and Classification of Schizophrenia: 

  • Reliabilty refers to the consistency of classfication system such as DSM 
  • The diagnosis of schizophrenia must be repeatable
    • Test-retest
      • clinicians must be able to reach the same conclusions at two different times 
    • Inter-rater reliability 
      • Different clinicians must be able to reach the same conlusions at the same time 
      • This can be measured using the kappa score 
        • <0.7 indicates lack of agreement, same conclusions not reached
        • 1 indicates perfect inter-rater reliability 
        • >0.7 is considered as a good inter-rater reliablity 
        • 0 indicates zero agreement 

Cultural differences in diagnosis: 

  • Copeland(1971):
    • 134 US and 194 Bristish psychiatriats given a desciption of a patient and asked to diagnose this patient 
    • 69% US psychiatrists gave the diagnosis of schizophrenia 
    • 2%of British gave similar diagnosis
  • Study shows that there are cultural differences between the diagnosis 
  • Luhrmann(2015):
    • Interviewed 60 adults who had been diagnosed with schizophrenia 
    • 20 each from Ghana, India and US
    • Each had been asked about the voices they had been hearing and their experiences with these voices 
    • Many African and Indian subjects reported having positive experiences with the voices as opposed to the US…


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