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133. Reliability of the Combined Stories Test (COST) and the Social Knowledge Test (SKT) in people with schizophrenia or with a personality disorder
There is a recognized need for good measures to assess social cognition in people with schizophrenia and other clinical populations. The Combined Stories Test (COST) and the Social Knowledge Test (SKT), assessing respectively theory of mind and social knowledge, present with good initial psychometric properties. This study aimed to additionally document the reliability of the COST and SKT in people with either schizophrenia (SZ) or a personality disorder (PD) and compare those groups together as well as with healthy controls (HC). The COST and SKT were administered twice to 30 SZ, 7 PD and 24 HC, with a four weeks interval between the assessments. The COST showed an excellent test-retest reliability (SZ:ρ=0,88; PD:ρ=0,80) and excellent inter-rater reliability (SZ κ=0.95 and PD κ=0.91 for items rated on a 2-point scale; SZ κ=0.83 and PD κ=0.80 for items rated on a 3-point scale). The SKT also presented excellent test-retest (SZ ρ=0,79; PD ρ=0,91) and inter-rater (κ=0.94; κ=0.96) reliability. Comparison of the performance between the three groups revealed a significant difference only for the COST (F(2, 58) = 3.68, p = 0.031), reflecting significantly lower scores in SZ compared to HC (t(42)=-2.721, p=0.009). The study is still ongoing, but current results already support the good reliability of the COST and SKT.