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Forest plots of the association between NfL expression level and TBI individuals. A: subgroup analysis according to sample collection time, B: subgroup analysis according to the detection method of NfL expression level; C: subgroup analysis according to different types of samples. Chi2 = Chi-Squared statistic, df = degrees of freedom, I2 = I-squared heterogeneity statistic, IV = inverse variance, SMD = standard mean difference, Z = Z-statistic.
