C1QTNF4 and Alzheimer disease: Compared with the CN group, plasma levels of CTRP3 (102.84 ± 12.60 vs. 122.70 ± 15.60, p < 0.0001), CTRP4 (267.30 ± 23.35 vs. 335.42 ± 24.49, p < 0.0001), and CTRP14 (17.43 ± 3.31 vs. 19.27 ± 3.90, p < 0.0001) in the AD group were increased (Table 1 and Figure S2).