Impact on Public Health Decision Making by Utilizing Big Data Without Domain Knowledge
This work highlights robustness issues in AI-driven public health decision-making, which is incremental as it builds on existing concerns about bias and spurious correlations in data use.
The study investigated the risks of using big data like street view imagery for public health decisions without domain knowledge, finding that built environment inferences from such data may misalign with ground truth and that altering 10% of samples in low-tertile areas could lead to a 4.17 to 17.2 times greater reduction in obesity or diabetes prevalence compared to interventions based on crosswalk counts.
New data sources, and artificial intelligence (AI) methods to extract information from them are becoming plentiful, and relevant to decision making in many societal applications. An important example is street view imagery, available in over 100 countries, and considered for applications such as assessing built environment aspects in relation to community health outcomes. Relevant to such uses, important examples of bias in the use of AI are evident when decision-making based on data fails to account for the robustness of the data, or predictions are based on spurious correlations. To study this risk, we utilize 2.02 million GSV images along with health, demographic, and socioeconomic data from New York City. Initially, we demonstrate that built environment characteristics inferred from GSV labels at the intra-city level may exhibit inadequate alignment with the ground truth. We also find that the average individual-level behavior of physical inactivity significantly mediates the impact of built environment features by census tract, as measured through GSV. Finally, using a causal framework which accounts for these mediators of environmental impacts on health, we find that altering 10% of samples in the two lowest tertiles would result in a 4.17 (95% CI 3.84 to 4.55) or 17.2 (95% CI 14.4 to 21.3) times bigger decrease on the prevalence of obesity or diabetes, than the same proportional intervention on the number of crosswalks by census tract. This work illustrates important issues of robustness and model specification for informing effective allocation of interventions using new data sources.