3.5. Multiple Regression Analysis with Four Demographic Factors between Total Bacteria Counts, Serum LBP, Fecal LPS, Anti-Pg-LPS IgG Antibody, and Anti-Pg-LPS IgA Antibody Levels with RA Disease Activity, and Bacteria-Related Biomarkers. The gene discussed is LBP; the disease is rheumatoid arthritis.