Household Income and Adult Asthma Risk in the United States: Evidence from the National Health Interview Survey

This study investigates the relationship between household income and adult asthma episodes in the United States using data from the 2019 and 2020 National Health Interview Survey (NHIS). Logistic regression models, adjusted for sex and education, revealed a significant inverse association between income and asthma risk, with the strongest protective effect in the $100,000–$150,000 bracket. Stratified analyses demonstrated effect modification by age, sex, and education, highlighting the complex interplay of socioeconomic determinants. These findings underscore the need for equity-oriented interventions addressing both environmental and social factors to reduce asthma disparities in adults.