A Scalable Framework to Integrate Social Determinants of Health into Disease Risk Models using Biobank Survey Data.

Complex diseases are a major global health burden, yet our ability to predict who is at risk remains limited. Risk is shaped by both heritable factors and non-genetic environmental, behavioral, and social determinants of health, but these are rarely modeled together. The growing availability of large-scale, multimodal biobanks creates new opportunities to integrate diverse data types into more accurate disease risk models. Here, we apply Multiple Correspondence Analysis (MCA) to over 100 environmental, behavioral, and social variables from the All of Us biobank (N = 171,614) to generate low-dimensional embeddings that quantify non-genetic risk for six common chronic conditions. These embeddings recovered known and novel risk factors and consistently improved prediction beyond demographics and polygenic scores (PGS), with contributions to model performance (ROC-AUC) ranging from 0.03 to 0.05. For five of six diseases, the gains from MCA embeddings surpassed those attributable to PGS. Genetic and non-genetic risks combined largely additively: we observed little evidence of interaction effects (ΔAUC < 0.001) and highly stable variant effect sizes when embeddings were included in genetic association models (