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Prevention of POCD by dexmedetomidine in patients compared to controls on first, third, and seventh day. Forest plot of odds ratio, analyzed by Mantel–Haenszel statistics in the random-effect model. Meta-analysis of the relationship on first day (Fig. 3a), third day (Fig. 3b) and seventh day (Fig. 3c), respectively. POCD = postoperative cognitive dysfunction.
