A methodological concern regarding small-sample propensity score matching and overfitting in the study of postoperative biologic strategies for Crohn’s disease

Key Points

• This letter raises concerns about the reliability of conclusions drawn from small-sample propensity score matching in Crohn's disease studies.
• Critiques matched cohort analysis methods in recent study
• Suggests utilizing validation techniques to check findings
• Calls for analysis on a larger, unmatched cohort to verify results.
• Findings may be unstable due to overfitting in the small cohort.
• Encourages reevaluation of conclusions using a broader patient sample.