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Table 2. Tau-b correlations between duration and severity

Domain

Tau-b correlation between duration and severity

Psychosis Schizophrenia syndrome Nonaffective psychosis Negative symptoms Disorganization Impairment Depression Depressive syndrome Mania Manic syndrome Mood psychosis

-0.14 0.39 0.44 0.78 0.66 0.36 0.72 0.83 0.81 0.86 0.75

Schizophrenia Bulletin, Vol. 28, No. 4, 2002

Table 3. Intraclass correlation coefficients

(reliability for summary ratings) for the

preliminary version of the Lifetime Dimensions

of Psychosis Scale

Variable

ICC

Psychosis1

0.77

Schizophrenia syndrome1

0.77

Nonaffective psychosis2

0.82

Negative symptoms1

0.66

Disorganization1

0.63

Impairment1

0.52

Depression2

0.64

Depressive syndrome2

0.76

Mania2

0.86

Manic syndrome2

0.87

Mood psychosis1

0.71

Chronicity of psychosis

0.73

Deterioration

0.73

Remission

0.26

Mean

0.70

Note.—ICC = intraclass correlation coefficient. Chronicity, deterio- ration, and remission ratings consisted of a single score (table 1).

1 Sum of severity + duration ratings for all items within the dimen- sion (e.g., items P1 through P6 for psychosis).

2 Sum of certainty + severity + duration ratings for that item.

688

D.F. Levinson et al.

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