Bicarbonate, blood urea nitrogen and cognitive function among us older adults, NHANES 2011–2014

Alzheimer's disease and kidney health have become serious and urgent public health issues. Bicarbonate and blood urea nitrogen is closely related to kidney function but the relationship of the bicarbonate, blood urea nitrogen and cognitive function which is one of the most important symptoms of Alzheimer's disease is still unclear. In this study we aimed to examine the association of the bicarbonate, blood urea nitrogen and cognitive function. This study used the NHANES database, from which 2681 eligible individuals over 60 years of age were selected. We also extracted cognitive related tests, bicarbonate and blood urea nitrogen concentration to statistically analyze. Logistic regression and restricted cubic splines (RCS) were performed with confounding variables such as gender, age, race, body mass index (BMI), and alcohol intake. After adjusting for multiple factors, statistical analyses indicated significant correlations between bicarbonate, blood urea nitrogen, and cognitive function tests, with varying strengths across different tests. A stratified analysis by gender revealed that there are also differences in the results by gender. Based on the research, we concluded that bicarbonate, blood urea nitrogen are correlated with cognitive function in older Americans. This effect varied across populations.