Association between family income to poverty ratio and nocturia in adults aged 20 years and older

Data from the National Health and Nutrition Examination Survey (NHANES) in 2005-2010, including 6,662 adults aged 20 or older, were utilized for this cross-sectional study. The baseline data was used to display the distribution of each characteristic visually. Multiple linear regression and smooth curve fitting were used to study the linear and non-linear correlations between PIR and nocturia. Subgroup analysis and interaction tests were conducted to examine the stability of intergroup relationships.

Methods
We obtained data from the NHANES database website for the three cycles of 2005-2006, 2007-2008, and 2009-2010. Data analysis, including baseline characteristic distribution, logistic regression analysis, RCS curves, and subgroup analysis, was conducted using StataMP17.0 and R language 4.2.2.