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Table 2 Scheme of level of evidence for each single study

From: Effects of organisational-level interventions at work on employees’ health: a systematic review

Level Definition
High The study has a randomized controlled design whose quality is greater than the median study quality.
Medium The study is either a randomized controlled design whose quality is less than the median study quality, or the study is a quasi-experimental control study whose quality is greater than the median study quality
Low The study is either a quasi-experimental control trial whose quality is less than the median study quality, or the study is a quasi-experimental one-group prospective or a cross-sectional one.