Table 4 Rho coefficients of correlation between participant characteristics. Significantly correlated factors were frailty and age (<i>p</i> = 2.2e−16), frailty and fasting status (<i>p</i> = 0.001), frailty and BMI (<i>p </i> = 0.0007), BMI and having fasted prior to sample collection (<i>p</i> = 0.001), and diet and age (<i>p</i> = 0.035).