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Results of subgroup analysis. (a) Boxplots of AK show a significant difference between the MTBI subgroup of 2–4 weeks of injury with DSB < 1 and the MTBI subgroup of 2–4 weeks of injury with DSB ≥ 1. (b) Boxplots of FA show significant differences between the MTBI subgroup of < 2 weeks of injury with LNS < 1 and the NC subgroup with LNS < 1; and between the NC subgroup with LNS < 1 and the NC subgroup with LNS ≥ 1. *p < 0.05.
