Table 1.

Differences between narrative review and systematic review.

Characteristics	Narrative Review	Systematic Review
Research Questions	Wide range	Focused on a specific question
Source of Original Literature	Typically not stated and may not be complete	Clear and complete
Search Methods	Typically not stated	Clear search strategy
Selection of Original Literature	Typically not stated and potentially biased	Clear selection criteria
Evaluation of Original Literature	No evaluation or with different evaluation methods	Following strict evaluation methods
Synthesis of results	Often using qualitative methods	Combination of qualitative and quantitative methods
Conclusions	Subjective and sometimes based on research evidence	Objective and strictly based on research evidence