TY  - JOUR
PY  - 1993//
TI  - Cannabis and schizophrenia: a longitudinal study of cases treated in Stockholm County
JO  - Acta psychiatrica Scandinavica
A1  - Allebeck, P.
A1  - Adamsson, C.
A1  - Engstrom, A.
A1  - Rydberg, U.
SP  - 21
EP  - 24
VL  - 88
IS  - 1
N2  - By means of the Stockholm County inpatient care register we identified all cases treated with a diagnosis of cannabis dependence and psychosis, not necessarily at the same occasion, during 1971-1983. By scrutinizing medical records, we evaluated the diagnosis according to DSM-III-R and we assessed the history of substance abuse as well as the psychiatric history and clinical course. We identified 229 cases during the follow-up; 112 of these cases (49%) fulfilled the DSM-III-R criteria for schizophrenia. The majority of the schizophrenics had prominent positive symptoms and a sudden onset of disease, and 69% of the cases had a record of heavy cannabis abuse at least 1 year before onset of psychotic symptoms. The high number of verified DSM-III-R cases of schizophrenia in this cohort and the temporal relation between cannabis abuse and schizophrenia further support the hypothesis that cannabis abuse may be a risk factor for schizophrenia. We confirmed previous observations that cannabis-associated schizophrenia often has a sudden onset and prominent positive symptoms.<p /> <p>Language: en</p> 
LA  - en
SN  - 0001-690X
UR  - http://dx.doi.org/
ID  - ref1
ER  -