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Assessing disease activity using the pediatric Crohn's disease activity index: Can we use subjective or objective
Amy Grant1, Trudy Lerer2, Anne M Griffiths3
1Division of Pediatrics, IWK Health, Halifax, NS B3K6R8, Canada.
Insights
The pediatric Crohn's disease activity index (PCDAI) shows subjective items change most. However, the full PCDAI or a composite of subjective and objective measures best classifies disease activity in children.
Area of Science:
- Pediatric Gastroenterology
- Clinical Trial Methodology
Background:
- The Pediatric Crohn's Disease Activity Index (PCDAI) is a standard tool for assessing disease activity in pediatric Crohn's disease clinical trials.
- Understanding which PCDAI components most effectively reflect disease state changes is crucial for accurate assessment.
Purpose of the Study:
- To identify specific items within the PCDAI that drive disease activity assessment.
- To analyze how subgroups of subjective and objective PCDAI items reflect changes in disease state over time in pediatric Crohn's disease.
Main Methods:
- Combined data from 703 children across three prospective datasets with full PCDAI data at baseline, 3 months (Q1), and 1 year (Q4).
- Examined changes in individual PCDAI scores from baseline to Q1 and Q4 using the non-weighted PCDAI.
Main Results:
- Abdominal pain, well-being, weight, and stooling demonstrated the highest change scores over time.
- Objective indicators like albumin, abdominal exam, and height velocity showed significant changes.
- While subjective and objective subgroups alone predicted less variance (18-22%), the full PCDAI or a composite scale predicted 32% of the variance in total PCDAI scores.
Conclusions:
- Subjective PCDAI items exhibit the most change over time, but are not sufficient alone for accurate disease classification.
- The complete PCDAI or a composite scale integrating both subjective and objective items provides a more robust assessment of disease activity than relying on either subgroup exclusively.
- Using only subjective or objective items as proxies may lead to misclassification of disease state in pediatric Crohn's disease.
Background:
The pediatric Crohn's disease activity index (PCDAI) is used as a standard tool to assess disease activity in clinical trials for pediatric Crohn's disease.
Aim:
To examine which items on the PCDAI drive assessment of disease activity, and how subgroups of subjective and objective items reflect change in disease state over time.
Methods:
Selective raw data from three prospectively collected datasets were combined, including 703 children with full PCDAI data at baseline, at 3-mo (Q1, n = 670), and 1-year (Q4, n = 474). Change in individual PCDAI scores from baseline to Q1 and to Q4 were examined using the non-weighted PCDAI.
Results:
Abdominal pain, well-being, weight, and stooling had the highest change scores over time. Objective indicators including albumin, abdominal exam, and height velocity followed. Change scores for well-being and abdominal exam did not explain significant variance at Q1 but were significant predictors at Q4 (P < 0.001 and P < 0.05). Subjective and objective subgroups of items predicted less variance (18% and 22%) on total PCDAI scores at Q1 and Q4 compared to the full PCDAI, or a composite scale (both 32%) containing significant predictors.
Conclusion:
Although subjective items on the PCDAI change the most over time, the full PCDAI or a smaller composite of items including a combination of subjective and objective components classifies disease activity better than a subgroup of either subjective or objective items alone. Reliance on subjective or objective items as stand-alone proxies for disease activity measurement could result in misclassification of disease state.
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