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Evaluation Points Revision
Reliability of DSM diagnosis of depression
Keller et al interrater reliability of DSM was 'fair to good', and testretest reliability is 'fair at best'. This
shows the DSM isn't a very reliable source for diagnosis of depression.
Keller et al suggested the reason why low reliability for diagnosing depression is you need 5 out of 9
symptoms to be diagnosed. So because someone believes you don't have the fifth symptom, could stand
between being diagnosed with depression or another less serious illness.
Validity of DSM diagnosis of Depression
McCullough et al found that some patients with major depressive disorder or dysthymia, had overlap of
symptoms between the different types of depression, making it hard to justify which type the patient had.
Reliability of BDI
Beck et al studied testretest reliability of the BDI on 26 outpatients one week apart. The first test there
was a correlation of .93 which had significant levels of testretest.
Visser et al assessed 92patients with Parkinsons Disease, he used the DSM and the BDI, and the BDI
produced a testretest reliability of .88 showing the BDI was a reliable measure of the severity of
Validity of BDI
BDI has high content validity, because it was constructed on symptoms of psychiatric patients.
BDI has high concurrent validity, because it has consistently demonstrated that it can measure depression
up against existing depression scales such as the Hamilton Depression Scale.
BDI has high Construct validity, because it has positively high correlation scores relates to symptoms like
anxiety and loneliness.