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This study demonstrates a critical failure mode in current healthcare AI, where models trained on specific demographics significantly degrade when applied to high-risk populations like the elderly and obese due to distribution shifts. The findings highlight an urgent need for fairness-aware development practices before deploying machine learning tools in clinical settings, as existing algorithms often underperform precisely where they are most needed.
Comprehensive Evaluation of Machine Learning for Type 2 Diabetes Risk Prediction: Large-Scale External Validation and Fairness Analysis
arXiv:2607.16253v1 Announce Type: cross Abstract: Machine learning-based Type 2 diabetes risk prediction models obtain good internal validation results but lose effectiveness in real-world applications due to deficient external testing and fairness assessment. We developed a multi-dimensional framework evaluating discrimination, calibration, interpretability, and algorithmic fairness on nationally representative populations. An XGBoost model was trained on NHANES 2015-2020 (n=15,685) using eight non-laboratory predictors: age, sex, race/ethnicity, BMI, smoking status, physical activity, history of heart attack, and history of stroke. External validation was performed on BRFSS 2020-2022 (n=1,285,783) under realistic distribution shift. Internal validation showed good discrimination (AUC=0.794, 95% CI 0.788-0.800), with performance loss on external validation (AUC=0.717, relative decrease: -9.7%, p=60) showed AUC=0.607 vs 0.742 for young adults (difference=0.135, p<0.001); obese individuals showed AUC=0.698 vs 0.735 for normal weight (difference=0.037, p<0.001). Gender showed comparable performance (male=0.723 vs female=0.712, p=0.142). Calibration revealed risk overestimation (Brier score=0.123). SHAP analysis identified age, BMI, and physical activity as primary risk drivers. Populations with highest diabetes risk receive the worst algorithmic performance, underscoring the need for fairness-aware, age-stratified deployment strategies before clinical use.
Abstract:Machine learning-based Type 2 diabetes risk prediction models obtain good internal validation results but lose effectiveness in real-world applications due to deficient external testing and fairness assessment. We developed a multi-dimensional framework evaluating discrimination, calibration, interpretability, and algorithmic fairness on nationally representative populations. An XGBoost model was trained on NHANES 2015-2020 (n=15,685) using eight non-laboratory predictors: age, sex, race/ethnicity, BMI, smoking status, physical activity, history of heart attack, and history of stroke. External validation was performed on BRFSS 2020-2022 (n=1,285,783) under realistic distribution shift. Internal validation showed good discrimination (AUC=0.794, 95% CI 0.788-0.800), with performance loss on external validation (AUC=0.717, relative decrease: -9.7%, p<0.001). Fairness analysis revealed severe bias: elderly adults (>=60) showed AUC=0.607 vs 0.742 for young adults (difference=0.135, p<0.001); obese individuals showed AUC=0.698 vs 0.735 for normal weight (difference=0.037, p<0.001). Gender showed comparable performance (male=0.723 vs female=0.712, p=0.142). Calibration revealed risk overestimation (Brier score=0.123). SHAP analysis identified age, BMI, and physical activity as primary risk drivers. Populations with highest diabetes risk receive the worst algorithmic performance, underscoring the need for fairness-aware, age-stratified deployment strategies before clinical use.
Accepted and published at the IEEE EDS Technically Sponsored International Conference on Intelligent Processing, Hardware, Electronics, and Radio Systems (CIPHER-2026), 13-15 Feb 2026, NIT Jalandhar, India (IEEE Conference Record #70417, Paper ID: 155). 8 pages, 4 figures, 3 tables
Machine Learning (cs.LG); Artificial Intelligence (cs.AI)
arXiv:2607.16253 [cs.LG]
(or arXiv:2607.16253v1 [cs.LG] for this version)
https://doi.org/10.48550/arXiv.2607.16253 arXiv-issued DOI via DataCite (pending registration)
Proc. 2026 Int. Conf. on Intelligent Processing, Hardware, Electronics and Radio Systems (CIPHER), Jalandhar, India, Feb. 2026
https://doi.org/10.1109/CIPHER70417.2026.11523789 DOI(s) linking to related resources
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