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.
 K. Frick, P.L. Jensen, M. Quinlan, T. Wilthagen, “Systematic occupational safety and health management: an introduction to a new strategy for occupational safety, health and well-being”. in Systematic occupational safety and health management: perspectives on an international management. Eds.: K. Frick, P. L. Jensen, M. Quinlan, T. Wilthagen. Emerald Group Publishing Limited, Bingley, 2000.
 L. Robson, J. Clarke, K. Cullens, A. Bielecky, C. Severin, P. Bigelow, E. Irvin, A. Culver, Q. Mahood, “The effectiveness of occupational health and safety management systems: a systematic review,” Safety Science, vol. 45, pp. 329–353, 2007. http://dx.doi.org/10.1016/j.ssci.2006.07.003
 K. Frick, J. Wren, “Reviewing occupational health and safety management: multiple roots, diverse perspectives and ambiguous outcomes”. in Systematic occupational safety and health management: perspectives on an international management. Eds: K. Frick, P.L. Jensen, M. Quinlan, T. Wilthagen. Emerald Group Publishing Limited, Bingley, 2000.
 L.S. Robson, P.L. Bingelow, “Measurement properties of occupational health and safety management audits: a systematic literature search and traditional literature synthesis,” Public Health, 101(2): S., pp 34–40, 2010.
 Directive 89/391/EEC- OSH “Framework Directive” of 12 June 1989 on the introduction of measures to encourage improvements in the safety and health of workers at work – “Framework Directive”, Official Journal of the European Union (OJL), 183: pp. 1–8, 29.06.1989.
 ILO, “Guidelines of the safety and health management systems,” (ILO-OSH-01), Geneva: International Labour Office, 2001.
 BSI (British Standard Institution), “Guide to occupational health and safety management systems,” British Standard institution, BS 8800:2004 BSI. London: 2004.
 EVS 18001:2007 (OHSAS 18001), SMSs, “Occupational Health and Safety Assessment Series,” Estonian Centre for Standardization (in Estonian). Estonia, 2007.
 E. Drais, M. Favaro, G. Aubertin, “Les systems de management santé-sécurité en enterprise: caractéristiques et conditions de mise en oeuvre,” Institut National de la Recherche et de la Sécurité, Paris, 2002.
 INRS. „Vers le management de la santé et de la sécurité au travail,” Institut National de Recherche et de Sante, Paris, 2004.
 S. Torp, T. Riise, B.E. Moe, “Systematic health, environment and safety activities: do they influence occupational environment, behaviour and health?” Occupational Medicine (Oxford), 50, pp. 326–333, 2000. http://dx.doi.org/10.1093/occmed/50.5.326
 J.I. Chang, L. Chiu-Lan, „Performance evaluation of process safety management systems of paint manufacturing facilities,” Journal of Loss Prevention in the Process Industries, vol. 22, pp. 398–402, 2009. http://dx.doi.org/10.1016/j.jlp.2009.02.004
 A. Sanchez-Toledo, B. Fernández-Muniz, J. M. Montes-Peon, C. J. Vazques-Ordas, “Spanish survey reveals motivations, obstacles and benefits of OHSAS 18001 certification,” ISO Management System: pp. 36–40, July–August 2009.
 B. Fernández-Muniz, J. M. Montes-Peon, C. J. Vazques-Ordas, “Occupational risk management under the OHSAS 18001 standard: analysis of perceptions and attitudes of certified firms,” Journal of Cleaner Production, vol. 24, pp. 36–47, 2012. http://dx.doi.org/10.1016/j.jclepro.2011.11.008
 B. Fernández-Muniz, J. M. Montes-Peon, C. J. Vazques-Ordas, “Safety climate in OHSAS 18001-certified organisations: Antecedents and consequences of safety behaviour,” Accident Analysis and Prevention, vol. 45, pp. 745–758, 2012. http://dx.doi.org/10.1016/j.aap.2011.10.002
 M. Koivupalo, M. Sulasalmi, P. Rodrigo, S. Väyrynen,”Health and safety management in a changing organisation: Case study global steel company,” Safety Science, vol. 74, pp. 128–139, 2015. http://dx.doi.org/10.1016/j.ssci.2014.12.009
 B. Fernández-Muñiz, J. M. Montes-Peón, C.J. Vázquez-Ordás, “Safety culture: analysis of the causal relationships between its key dimensions,” Journal of Safety Research, vol. 38, pp. 627–641, 2007. http://dx.doi.org/10.1016/j.jsr.2007.09.001
 J. Abad, E. Lafuente, J. Vilajosana, “An assessment of the OHSAS 18001 process: Objective drivers and consequences on safety performance and labour productivity,” Safety Science, vol. 60, pp. 47–56, 2013. http://dx.doi.org/10.1016/j.ssci.2013.06.011
 W. Pearse, “Club Zero: Implementing OHSMS in small to medium fabricated metal product companies,” Journal of Occupational Health and Safety – Australia New Zealand, vol. 18, pp. 347–356, 2002.
 A. Kamp, K.L. Blansch, „Integrating management of OHS and the environment: participation, prevention and control,” in Systematic Occupational Health and Safety Management: perspectives on an international development. Eds.: K. Frick, P.L. Jensen, M. Quinlan, T. Wilthagen. Emerald Group Publishing Limited, Bingley, 2000.
 K. Nielsen, “Organisational theories implicit in various approaches to OHS management,” in Systematic Occupational Health and Safety Management: perspectives on an international development. Eds.: K. Frick, P.L. Jensen, M. Quinlan, T. Wilthagen. Emerald Group Publishing Limited, Bingley, 2000.
 L. Granerud, R. S. Rocha, “Organisational learning and continuous improvement of health and safety in certified manufacturers,” Safety Science, vol. 49, pp. 1030–1039, 2011. http://dx.doi.org/10.1016/j.ssci.2011.01.009
 R.S. Rocha, “Institutional effects on occupational health and safety management systems,” Human Factors in Ergonomics and Manufacturing, vol. 20, pp. 211–225, 2010. http://dx.doi.org/10.1002/hfm.20176
 G. Zwetsloot, “Developments and debates on OHSM system standardisation and certification,” in Frick, K., Jensen, P.L., Quinlan, M., Wilthagen, T. (eds.), Systematic Occupational Health and Safety Management, Perspectives on an International Development. Emerald Group Publishing Limited, Bingley, 2000.
 A. Kuusisto, “Safety management systems: Audit tools and reliability of auditing,” [dissertation] Tampere (Finland): Tampere University of Technology, 2000.
 J. Peltonen, “Review of SMS Audit Techniques and Methods – Final Report,” European Railway Agency, pp. 249, 2013
 A. Field, “Discovering Statistics using IBM SPSS Statistics. Fourth Edition, SAGE Publications Ltd, London, 2013
 R. Likert, “A Technique for the Measurement of Attitudes,” Archives of Psychology, vol. 140, pp. 1–55, 1932.
 Occupational Health and Safety Act of Estonia. State Gazette in Estonia, RT I 1999, 60, 616.
 Õ. Paas, K. Reinhold and P. Tint, “Estimation of safety performance by MISHA method and the benefits of OHSAS 18001 implementation in Estonian manufacturing industry,” Agronomy Research, vol. 13, pp. 792–809, 2015.
 International Standardisation Organisation. ISO14001:2004 Environmental management systems – Specification with guidance for use, 2004.