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The postoperative delirium incidence in the first quartile and the combination of the other three quartiles of CSF Aβ40/Tau or Aβ42/Tau ratio. Chi-square test shows that there is a significant difference in the postoperative delirium incidence between the first quartile (red bar) and the combination of the second, third, and fourth quartiles (blue bar) of CSF Aβ40/Tau (A) or Aβ42/Tau ratio (B).
