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Observer variation in detecting lymphadenopathy on chest radiography
G Du Toit1, G Swingler, K Iloni
1School of Child and Adolescent Health, Red Cross Children's Hospital and University of Cape Town, South Africa. gdutoit@ich.uct.ac.za
Summary
Pediatric pulmonologists showed fair agreement in detecting childhood lymphadenopathy on chest X-rays. Moderate agreement was found for individual doctors, suggesting caution in clinical decisions based on these findings.
Area of Science:
- Pediatric radiology
- Tuberculosis diagnostics
- Medical imaging analysis
Background:
- Lymphadenopathy detection on chest radiography is crucial for diagnosing pediatric tuberculosis.
- Variability in interpretation can impact clinical management.
Purpose of the Study:
- To evaluate the consistency of lymphadenopathy detection among pediatric pulmonologists using chest radiographs.
- To quantify inter- and intra-observer agreement in interpreting these findings.
Main Methods:
- Retrospective review of chest radiographs from children (1 month–11 years) diagnosed with tuberculosis or pneumonia.
- Four pediatric pulmonologists independently assessed radiographs for lymphadenopathy (present, absent, equivocal).
- Agreement was measured using weighted kappa statistics.
Main Results:
- Inter-observer agreement (average weighted kappa: 0.33) was rated as 'fair'.
- Intra-observer agreement (average weighted kappa: 0.55) was rated as 'moderate'.
- Specific inter-observer kappa values ranged from 0.14 to 0.52; intra-observer kappa values ranged from 0.44 to 0.71.
Conclusions:
- Paediatric pulmonologists exhibit fair inter-observer and moderate intra-observer agreement in identifying lymphadenopathy on pediatric chest radiographs.
- Clinical decisions relying solely on chest radiography findings for lymphadenopathy should be approached with caution.