Fig. 1
The AI/AN population experiences higher prevalence of chronic respiratory disease. A Location of federally recognized and statistical American Indian and Alaska Native entities in blue, including reservations. States included in this study are labeled with two-letter abbreviation and were oversampled in 2017 due to historically increased AI/AN representation. The map shown was produced using the tigris package [22] in R with shapefiles publicly available from the US Census Bureau [23]. B Adjusted prevalence of chronic respiratory disease in AI/AN and non-Hispanic white respondents surveyed in years 2011–2018. Comparisons between AI/AN vs white are statistically significant by χ2 test for all years except 2015