IL6 and sarcopenia: Interestingly, contrary to previous studies that showed a significant positive correlation between IL-6 and sarcopenia [104,105,106], this study did not identify a significant positive correlation between IL-6 (SMD = 0.25, 95% CI (−0.01, 0.52), K = 17, N = 2710, I2 = 88.7%) and sarcopenia, with a substantial positive correlation evident only in developing countries (Figure S23).