Table 1.

Eligibility criteria for the overview of reviews on OHS interventions

	Inclusion criteria	Exclusion criteria
Study design	Systematic reviews (with or without meta-analysis) of randomised controlled trials, non-randomised controlled trials, controlled before-after studies and/or interrupted time series Systematic reviews of other study designs only if they reported a subgroup analysis on the study designs listed above, or at least 50% of included studies corresponded to those study designs	Primary studies, narrative reviews, editorials, opinion papers
Population	Any kind of employees aged 15 or over, who were not self-employed Mixed population of employed and self-employed employees only if at least 50% employed	Exclusively self-employed persons Specific occupations (ie, teachers or sex workers)
Intervention	All types of workplace-related interventions designed to protect against occupational injuries and for the primary prevention of occupational diseases:  Organisational-level workplace interventions according to Montano et al 16: (1) material conditions, (2) work time-related conditions, (3) work organisation conditions  Provision of educational materials (eg, brochures, films)  Training, counselling or workshops aimed at multipliers or directly at employees and workers  Legislation  Audits by the health and safety executive	Vaccinations at the workplace
Comparison	Another intervention (active control) or no intervention
Outcomes	Prevalence, incidence and severity of occupational diseases, occupational injuries, physical disability, physical symptoms (eg, pain experience) Sickness absence rates Risk factors that can lead to occupational injuries or diseases	Surrogate parameters (eg, high blood pressure)  Quality changes at organisational level (eg, in production)  Cost efficiency  Job satisfaction or work motivation
Setting	Interventions at the workplace  Studies conducted in OECD (Organisation for Economic Cooperation and Development) countries (at least 50% of included studies in SR)	Interventions in: Leisure time School Non-OECD countries

OHS, occupational health and safety; SR, systematic review.