Identifying critical intervention, contextual and implementation features in systematic reviews: Intervention...

Area of Science:

• Health Services Research
• Systematic Review Methodology

Background:

• Systematic reviews increasingly require data on intervention, contextual, and implementation factors for successful outcomes.
• Intervention Component Analysis (ICA), introduced in 2015, offers a structured approach to examining trials within effectiveness syntheses.
• ICA involves inductive coding, extracting trialist perspectives, and assessing feature-outcome relationships.

Purpose of the Study:

• To review the application and development of ICA since its introduction in 2015.
• To demonstrate the diverse ways ICA has been employed by researchers.
• To identify potential future advancements for the ICA method.

Main Methods:

• A Google Scholar search was conducted in March 2025 for papers citing the 2015 ICA publication.
• Data extracted included publication year, ICA usage (analysis vs. citation), employed ICA aspects, combination with other methods, and innovations.
• In-depth case studies were performed to explore application variations and benefits of ICA.

Main Results:

• 95 papers cited the 2015 ICA paper; 44 used ICA in analysis, and 4 planned to use it.
• Most applications (38/48) combined ICA with other methods like meta-analysis or qualitative comparative analysis.
• Innovative uses included integrating ICA with existing frameworks or logic models.

Conclusions:

• ICA enhances systematic reviews by elucidating the mechanisms of intervention effectiveness.
• The method is versatile, adaptable for various review sizes, and usable independently or with other approaches.
• Future developments may involve subgroup analysis and meta-regression to test ICA-generated theories.