Registered Nurses' Association of Ontario

Levels of Evidence

Type of Evidence Description of Evidence
A Evidence obtained from controlled studies, meta-analyses
A1 Systematic review
B Evidence obtained from descriptive correlational studies
C Evidence obtained from qualitative research
D Evidence obtained from expert opinion
D1 Integrative reviews
D2 Critical reviews

 

Healthy Work Environment
Developing and Sustaining Effective Staffing and Workload Practices
Healthy Work Environment Recommendations