Figure 2.
Forest plots of the association between NfL expression level and TBI individuals. A: overall analysis; B: subgroup analysis according to ethnicity; C: subgroup analysis according to the different included individuals. For each study, the estimate of mean NfL level difference and its 95% confidence interval (95% CI) is plotted with a diamond. Chi2 = Chi-Squared statistic, df = degrees of freedom, I2 = I-squared heterogeneity statistic, IV = inverse variance, SMD = standard mean difference, Z = Z-statistic.