Ensuring fairness in machine learning to advance health equity.
Open accessAbstract
Machine learning is used increasingly in clinical care to improve diagnosis, treatment selection, and health system efficiency. Because machine-learning models learn from historically collected data, populations that have experienced human and structural biases in the past-called protected groups-are vulnerable to harm by incorrect predictions or withholding of resources. This article describes how model design, biases in data, and the interactions of model predictions with clinicians and patients may exacerbate health care disparities. Rather than simply guarding against these harms passively, machine-learning systems should be used proactively to advance health equity. For that goal to be achieved, principles of distributive justice must be incorporated into model design, deployment, and evaluation. The article describes several technical implementations of distributive justice-specifically those that ensure equality in patient outcomes, performance, and resource allocation-and guides clinicians as to when they should prioritize each principle. Machine learning is providing increasingly sophisticated decision support and population-level monitoring, and it should encode principles of justice to ensure that models benefit all patients.
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Transparent decision-making processes in healthcare AI, with patients and providers understanding the rationale behind AI-driven recommendations, foster trust and accountability.
“Transparent decision-making processes are vital in healthcare AI. Patients and healthcare providers must understand the rationale behind AI-driven recommendations, fostering trust and accountability.[23]”
From Ethical implications of AI and robotics in healthcare: A review (2023) · cites this paper as [23]
The “What Is Machine Learning?” section says complex models can be hard to understand and trust, supporting a link between understandability and trust. The Abstract recommends involving stakeholders in model design. Neither passage says patients and providers must understand the rationale for individual AI recommendations or that doing so fosters accountability (pages not provided in our copy). (LLM, conf=0.82)
Experimental — accuracy not yet measuredParticipatory approaches play a vital role in bridging the gaps between model development and deployment and in promoting fairness in ML applications.
“Participatory approaches play a vital role in bridging the gaps between model development and deployment and in promoting fairness in ML applications (Rajkomar et al., 2018).”
From The BigScience ROOTS Corpus: A 1.6TB Composite Multilingual Dataset (2023) · cites this paper as Rajkomar et al., 2018
SDoH variables reflect structural inequities, and model outputs using them could inadvertently reinforce disparities if misapplied.
“Because SDoH variables reflect structural inequities, there is a risk that model outputs could inadvertently reinforce disparities if misapplied [91,92].”
From Machine learning-driven risk prediction for post-hospitalization diabetes case management: Integrating clinical and social determinants of health (2026) · cites this paper as [91]
How principles of algorithmic fairness might apply in clinical decision-making has received little attention in the medical literature.
“how principles of algorithmic fairness might apply in clinical decision-making has received little attention in the medical literature7,8.”
From Predictably unequal: understanding and addressing concerns that algorithmic clinical prediction may increase health disparities (2020) · cites this paper as [7]
One of the main challenges to develop trustworthy AI is to define the meaning of fairness in machine learning practice.
“One of the main challenges to develop trustworthy AI is to define the meaning of fairness in the practice of machine learning111.”
From Sex and gender differences and biases in artificial intelligence for biomedicine and healthcare (2020) · cites this paper as [111]
AI solutions have led to inadvertent bias of modeling results, with increasing concerns and related examples across diverse populations.
“As AI becomes more pervasive in both public and personal health across diverse populations, there have been increasing concerns, and related examples, of AI solutions leading to inadvertent bias of modeling results (45–48).”
From Accessing Artificial Intelligence for Clinical Decision-Making (2021) · cites this paper as [46]
Biases can be found in AI model design, training data, interactions with clinicians, and interactions with patients.
“In general, biases can be found in AI model design (e.g.label bias and cohort bias), training data (e.g.minority bias, missing data bias), interactions with clinicians (e.g.automation bias and feedback loops bias), and interactions with patients (e.g.privilege bias and agency bias)”
From SHIFTing artificial intelligence to be responsible in healthcare: a systematic review (2022) · cites this paper as Rajkomar et al., 2018
Some potential solutions have been developed, such as exploring local datasets or local checklists for training AI, and conducting validation checks to mitigate label choice bias, but this challenge seems to persist.
“Some potential solutions have been developed, such as exploring local datasets or local checklists for training AI (Rajkomar et al., 2018(Rajkomar et al., , 2019;;Vollmer et al., 2020), and conducting validation checks to mitigate label choice bias (Char et al., 2020;Obermeyer et al., 2019), but this challenge seems to persist.”
From SHIFTing artificial intelligence to be responsible in healthcare: a systematic review (2022) · cites this paper as Rajkomar et al., 2018
Biases in AI can emerge from two main sources: the data used for algorithm training (data bias) and inherent design or learning mechanisms of the algorithm itself (algorithmic bias).
“Generally, biases in AI can emerge from two main sources: the data used for algorithm training (data bias) and inherent design or learning mechanisms of the algorithm itself (algorithmic bias).”
From Fairness of artificial intelligence in healthcare: review and recommendations (2024) · cites this paper as [11]
In the medical field, bias and discrimination in AI have been studied in various domains.
“In the medical field, bias and discrimination in AI have been studied in various domains [11, 12].”
From Fairness of artificial intelligence in healthcare: review and recommendations (2024) · cites this paper as [11]
In the healthcare context, additional biases may arise because of the complex nature of human interactions and decision-making processes, and these can be classified into biases from AI-clinician interactions and biases from AI-patient interactions.
“However, in the healthcare context, additional biases may arise because of the complex nature of human interactions and decision-making processes. These additional biases can be classified into two types: those that originate from AI–clinician interactions and those that originate from AI–patient interactions [11].”
From Fairness of artificial intelligence in healthcare: review and recommendations (2024) · cites this paper as [11]
Minority bias occurs when the number of protected group members in the dataset is insufficient for AI to learn accurate statistical patterns, which can lead to decreased performance and biased results when the algorithm is applied to these underrepresented groups.
“Minority bias occurs when the number of protected group members in the dataset is insufficient for AI to learn accurate statistical patterns. This can lead to decreased performance and biased results when the algorithm is applied to these underrepresented groups.”
From Fairness of artificial intelligence in healthcare: review and recommendations (2024) · cites this paper as [11]
Even with representative data without data bias, AI can exhibit bias because of its inherent design or learning mechanisms.
“Even with representative data without data bias, AI can exhibit bias because of its inherent design or learning mechanisms.”
From Fairness of artificial intelligence in healthcare: review and recommendations (2024) · cites this paper as [11]
Informativeness bias occurs when the features used for detection are not as apparent for certain protected groups, lowering their informativeness when predictions are made.
“Informativeness bias occurs when the features used for detection are not as apparent for certain protected groups, lowering their informativeness when predictions are made.”
From Fairness of artificial intelligence in healthcare: review and recommendations (2024) · cites this paper as [11]
When healthcare professionals interact with AI, biases related to interactions can occur, potentially affecting the algorithm's performance, fairness, and adoption.
“When healthcare professionals interact with AI, biases related to interactions can occur, potentially affecting the algorithm's performance, fairness, and adoption [11].”
From Fairness of artificial intelligence in healthcare: review and recommendations (2024) · cites this paper as [11]
Allocation discrepancy occurs when the positive predictive values for protected groups are disproportionately low, leading the AI to withhold necessary resources, and such resource allocation discrepancies can exacerbate disparities in care and outcomes among the affected groups.
“Finally, an allocation discrepancy occurs when the positive predictive values for protected groups are disproportionately low, leading the AI to withhold necessary resources, such as clinical attention or social services. Such resource allocation discrepancies can exacerbate disparities in care and outcomes among the affected groups.”
From Fairness of artificial intelligence in healthcare: review and recommendations (2024) · cites this paper as [11]
Missing data bias occurs when data from protected groups are missing nonrandomly, making it difficult for AI to generate accurate predictions.
“Missing data bias occurs when data from protected groups are missing nonrandomly, making it difficult for AI to generate accurate predictions.”
From Fairness of artificial intelligence in healthcare: review and recommendations (2024) · cites this paper as [11]
AI systems are increasingly in a position to help improve patient and population health outcomes and drive down cost, increase physician job satisfaction, and address health disparities.
“Thus, AI systems are increasingly in a position to help improve patient and population health outcomes and drive down cost, increase physician job satisfaction, and address health disparities20,21,3,22,23.”
From Considerations for addressing bias in artificial intelligence for health equity (2023) · cites this paper as [20]
If the training data used to develop ML and AI models are not representative of the broader population or if they contain historical biases, the resulting algorithms may perpetuate or even amplify these biases.
“If the training data used to develop these models are not representative of the broader population or if they contain historical biases, the resulting algorithms may perpetuate or even amplify these biases [58].”
From Integrating machine learning and artificial intelligence in life-course epidemiology: pathways to innovative public health solutions (2024) · cites this paper as [58]
Breast cancer detection systems may perform differently based on breast density variations across ethnic groups.
“Similarly, breast cancer detection systems may perform differently based on breast density variations across ethnic groups [117,118].”
From Artificial Intelligence in Clinical Oncology: From Productivity Enhancement to Creative Discovery (2025) · cites this paper as [117]
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“106 Second, the dataset used to train a model 107 or the outcome that a model predicts 108 can have significant implications for how models lessen or worsen disparities in healthcare.”
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“’’(32) More than simply doing no harm, a GLHS should actively support greater health equity.(4,105) Of central importance is whether clinical data, or model parameters if deploying a federated learning approach, could be viewed and secured as a public good insofar as all stakeholders, both healthcare and private indus…”
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“If the training data used to develop these models are not representative of the broader population or if they contain historical biases, the resulting algorithms may perpetuate or even amplify these biases [58].”
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“Centering Participation in Data Curation Participatory approaches play a vital role in bridging the gaps between model development and deployment and in promoting fairness in ML applications (Rajkomar et al., 2018).”
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A Review of Applications of Machine Learning in Mammography and Future Challenges
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- Authors
- Rajkomar, A., Hardt, M., Howell, M. D., Corrado, G., & Chin, M. H.
- Affiliations
- Google (United States) (US)
- University of Chicago (US)
- Venue
- Annals of Internal Medicine
- Publisher
- American College of Physicians
- Published
- 2018-12-18
- Volume
- 169
- Issue
- 12
- Pages
- 866-872
- ISSN
- 0003-4819 (ISSN-L)
- 1539-3704
- PMC
- PMC6594166
- OpenAlex
- W2902802452
- Cited by
- 1,341
- References
- 41
- Citations by year
- 2026: 380 · 2025: 292 · 2024: 190 · 2023: 155 · 2022: 119 · 2021: 107 · 2020: 71 · 2019: 23 · 2018: 2 · 2012: 1
- FWCI
- 100.84
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Annals of Internal Medicine (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institute of Diabetes and Digestive and Kidney Diseases (P30DK092949)
- Topics
- Social Sciences › Safety Research › Ethics and Social Impacts of AI
- Health Sciences › Medicine › Health Informatics › Artificial Intelligence in Healthcare and Education
- Physical Sciences › Computer Science › Artificial Intelligence › Machine Learning in Healthcare
- Keywords
- algorithmic fairness, health equity, health care disparities, distributive justice, protected groups, structural bias, algorithmic bias, resource allocation, clinical decision support, model evaluation
- MeSH terms
- Machine Learning, Health Equity, Critical Care, Humans, Length of Stay, Social Justice, Health Care Rationing, Healthcare Disparities, Patient Outcome Assessment
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