Occupational risk prevention can be managed in several ways. Voluntary safety management standard OHSAS 18001 is a tool, which is considered to give contribution in effective risk management in the manufacturing industry. The current paper examines the benefits of OHSAS 18001 based on the statistical analysis. MISHA method is used for safety audit in 16 Estonian enterprises. The results demonstrate the objectives why companies implement or are willing to implement OHSAS 18001, bring out differences in safety activities for 3 types of companies and determine correlations among different safety activity areas. The information is valuable for enterprises that are willing to improve their safety activities via a voluntary safety management system