Reliability Research Classification

Question 0

Soderberg at al
2005
81% concordance rates
DSM (up to date version 4)

Answer 0

Suggests classification systems have become more reliable over time

• better knowledge
• advanced science

Question 1

Beck et al
1952
54%concordance rates between experienced practitioners diagnosis 
DSM 
153 patients

Answer 1

.

Question 2

Nilsson at al
2000
60% concordance rate for ICD

Answer 2

DSM is more reliable

Question 3

Whaley
2001
Inter-rarer reliability correlation as low as 0.11

Answer 3

Recent study, still not reliable

Question 4

Read at al
2004
Test retest reliability 37% concordance

Noted a 1970 study by
Copeland
British and U.S. Provided diagnosis in case description
69% American diagnosed SZ
2% British diagnosed SZ

Answer 4

Suggesting diagnosis of schizophrenia has never been reliable

Question 5

Rosenhan (1973)
‘On being sane in insane places’
Norman people went to psychiatric hospitals
Said they heard voice ‘empty’, ‘hollow’ and ‘thud’
All diagnosed as SZ
Acted normal in hospital but no nurse noticed

Answer 5

Follow up study:
Said he was releasing more ‘pseudo patients’
21% detection rate of fake patients
But there were no fake patients

Question 6

Prescott at al
1986
Test retest measures of attention and information processing in 14 chronic SZ
Performance stable over 6 month period

Answer 6

Test retest is generally good