Nursing Best Practice Guidelines

Levels of Evidence

Level	Source of Evidence
Ia	Evidence obtained from meta-analysis or systematic reviews of randomized controlled trials, and/or synthesis of multiple studies primarily of quantitative research.
Ib	Evidence obtained from at least one randomized controlled trial.
IIa	Evidence obtained from at least one well-designed controlled study without randomization.
IIb	Evidence obtained from at least one other type of well-designed quasi-experimental study without randomization.
III	Synthesis of multiple studies primarily of qualitative research.
IV	Evidence obtained from well-designed non-experimental observational studies, such as analytical studiesG, descriptive studiesG, and/or qualitative studies.
V	Evidence obtained from expert opinion, committee reports, and/or clinical experiences of respected authorities.

Women and Children

Breastfeeding Best Practice Guidelines for Nurses

Practice Recommendations