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(A) Lower plasma levels of leptin significantly correlated with a lower MMSE score (r = 0.264; P = 0.019). (B) High leptin plasma levels positively correlated with an increased body mass index (BMI) (r = 0.428; P = 0.001) and (C) inversely correlated with advancing age (r = −0.225; P = 0.048).
