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Most studies, as can be seen in Figure 4.1.6, considered either multiple (more than 20 worksites) or single workplaces. While more studies examining multiple workplaces proceeded to data extraction than those studying single workplace, there is a difference between studies exploring voluntary vs. mandatory programs. Of studies meeting the minimum quality to proceed to data extraction, those looking at voluntary OHSMSs generally involved only one workplace setting (1 workplace, n=3; 20+ workplaces, n=1); while those studies looking at mandatory OHSMSs all examined multiple workplace settings (i.e., >20 workplaces).

F ig u re 4 .1 .6 N u m b e r o f W o rk p la c e s

Number of Studies

8 7 6 5 4 3 2 1 0

M a n d a to ry N o n -D E s tu d ie s M a n d a to ry D E s tu d ie s V o lu n ta ry N o n -D E s tu d ie s V o lu n ta ry D E s tu d ie s

1 w o rk p la c e

2 -1 9 w o rk p la c e s

>20 w o rk p la c e s

Studies examined workplaces of various sizes (see Figure 4.1.7). Those studies that proceeded to data extraction most frequently investigated workplaces of mixed sizes. However, small and medium enterprises (SME) and large workplaces were also well represented in the studies proceeding to data extraction. As might be expected, all of the studies that were unclear on workplace size were of insufficient quality to proceed to data extraction.

Figure 4.1.7. Size of Workplace

Number of Studies

7 6 5 4 3 2 1 0

Non-DE studies DE studies



Larg e


Effectiveness of Occupational Health & Safety Management Systems: A Systematic Review


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