In addition, the Global Burden of Disease Study 2015 presents deaths related to HIV and hepatitis C as well as other causes that are mostly omitted from UNODC reporting. Oceania (based on data from Australia and New Zealand only) also has a high drug-related mortality rate, at more than 2.5 times the global average. A large number of drug-related deaths (35 per cent of the global total) are estimated to occur in Asia, although this number is tentative because of poor regional coverage and reporting of mortality data. Despite the large number of deaths, the drug-related mortality rate in Asia is below the global average. Because of differences in reporting, comparisons across countries and regions should be made with the greatest of care.