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Individual and pooled SMD results with 95%CI for CD34 and WHO grades, age, and gender. The random-effects model analysis showed an association between CD34 and WHO grades (n = 12, SMD -1.503, 95% CI: -1.685 to-1.321; P = 0.000) (A). There was no significant association between CD34 and age (SMD -0.223, 95% CI: -0.602 to 0.156; P = 0.248) (B) and gender (SMD -0.059, 95% CI: -0.439 to 0.321; P = 0.761) (C).
