[Introduction to the indirect meta-analyses].

Area of Science:

• Evidence-based medicine
• Biostatistics
• Health research methodology

Context:

• Standard meta-analyses rely on direct comparisons from randomized clinical trials.
• Limited direct comparative literature necessitates alternative synthesis methods.
• Indirect comparisons provide a valuable tool when direct evidence is unavailable.

Purpose:

• To elucidate the conceptual underpinnings of indirect comparisons.
• To examine the necessity and applications of indirect comparative reviews.
• To clarify the limitations of indirect comparisons in evidence synthesis.

Summary:

• Meta-analyses aggregate research on specific themes, assessing methodological quality.
• Indirect comparisons serve as an alternative to standard meta-analyses when direct trial data is absent.
• This review focuses on the theoretical basis, utility, and constraints of indirect comparisons.

Impact:

• Enhances understanding of advanced evidence synthesis techniques.
• Supports informed decision-making in clinical practice and health policy.
• Facilitates a deeper comprehension of network meta-analyses for comprehensive treatment evaluation.