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Systematic review with meta-analysis.
PsycINFO and Medline, 1966 to 2004; reference lists from these studies; requests for unpublished research data.
Study selection and analysis:
Studies were included if they assessed the effect of psychological interventions on pathological gambling behaviour, and provided enough data to calculate effect sizes. Exclusion criteria: case studies, non-English language publication. Effect sizes were calculated as treatment minus control means for RCTs, and post-treatment minus pretreatment means for before and after studies, divided by the pooled standard deviation, and weighted by sample size. For studies with more than one gambling behaviour outcome, the average of effect size for each measure …
For correspondence: Ståle Pallesen, Department of Psychosocial Science, Christiesgt, 12, 5015 Bergen, Norway;
Sources of funding: none stated.