No additive effect of cannabis on cognition in schizophrenia

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• 作者：Brian D. Power^a ; ^b ; ^c ; ^{briandiarmidpower@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Milan Dragovic^c ; ^d ; Johanna C. Badcock^d ; ^e ; Vera A. Morgan^d ; ^e ; David Castle^f ; Assen Jablensky^d ; ^e ; Nikos C. Stefanis^c ; ^d
• 关键词：Schizophrenia ; Cannabis ; Confounding ; Psychosis ; Cognition
• 刊名：Schizophrenia Research
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：168
• 期：1-2
• 页码：245-251
• 全文大小：621 K

文摘

We aimed to examine the association between lifetime cannabis use and estimates of both premorbid and current cognitive function in psychotic disorders in an Australian cohort.

Methods

In an Australian multicenter cohort, 1237 participants with an established ICD-10 diagnosis of psychotic disorder were categorised according to history of lifetime cannabis use (non-users, n = 354; cannabis users, n = 221; cannabis dependency, n = 662). Groups were analyzed according to available indices of cognitive ability: the National Adult Reading Test — Revised (NART-R) for ability prior to illness onset; and the Digit Symbol Coding Test (DSCT) for current ability. Two-way analysis of variance was conducted without any covariate, followed by a two-way analysis of covariance (using age, age at onset of psychiatric illness, premorbid IQ and the Socio-Economic Index for Areas (SEIFA) rankings).

Results

Whilst there appeared to be a significant association between cannabis use and mean DSCT (higher DSCT scores in cannabis using groups) F(2,1080) = 9.478, p < 0.001, 畏2 = 0.017), once covariates were used in the analysis there were no significant differences between groups in mean DSCT scores (F(2,1011) = 0.929, p = 0.395, 畏2 = 0.002). Similarly there were no differences between groups in mean NART scores once, age, age at illness onset and SEIFA rankings were used as covariates (F(2,1032) = 1.617, p = 0.199, 畏2 = 0.003).

Conclusions

Confounding variables underpin the association between cannabis use and cognitive function in psychotic disorders. Taken together, it would appear that cannabis use or dependence has no additive effect on cognitive dysfunction in these disorders.