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For this meta-analysis, the aim is to estimate the prevalence and to determine the factors associated with changes in this prevalence in the world. A systematic review of PubMed/Medline, ISI Web of Knowledge, Scopus, and Science Direct, SID, and Google Scholar from 2011 to April 2020 was performed. Point prevalence was analyzed with a 95% confidence interval. The variances of each study were calculated using a two-sentence distribution formula, and the heterogeneity between the studies was assessed by the Q-Cochran test with a significance level of less than 0.1. Also, the index of changes attributed to I 2  was examined. Due to the heterogeneity between the studies, the random-effects model was used to combine the results of the studies. All statistical analyses were performed by the STATA software version 11 using Meta-Analysis commands. The significance level of the tests was considered to be P &lt; 0.05. The prevalence of mortality in motorcyclists in six studies was reported to be 12% (0.05-0.18 = 95% CI). We stratified this study by participant geographical region and age group. In this study, the highest prevalence of mortality was in the under-30 age group. Furthermore, planning educational campaigns and advertisements by state authorities that are pointing out the harmful effects of motorcyclists' cocaine and/or other substances consumption is necessary.

A meta-analysis study of worldwide prevalence of mortality in cocaine-consuming motorcyclists