Reliability of the ICD

Question 1

Cohen’s kappa value

Answer 1

a quantitative measure of reliability for 2 raters that are rating the same thing, corrected for how often the raters may agree by chance
there is a correlation value to represent the proportion of people who recieved the same diagnosis when assessed and re-assessed.
0.7 and above considered good

Question 2

Ponizovsky

Answer 2

compared reliability of the ICD 9 and 10.
3000 patients
68% reliability of diagnosis of schizophrenia (1989)
94.2% (2003)
shows good test re-test reliability