Figure 3. Logistic regression analyses to determine the odds ratios for phenotypic frailty according to serum kynurenine tertiles (A) before and (B) after adjusting for sex, age, and BMI. Phenotypic frailty is defined based on the Fried’s criteria. *Statistically significant difference from the lowest tertile (T1). Abbreviations: BMI, body mass index; OR, odds ratio; CI, confidence interval.