NEFL and nervous system disorder: Both NfL and GFAP correlated with 10–15-year GOS 1–5 (rs =  − 0.34, p = 0.026, and rs =  − 0.37, p = 0.013), but after adjustment for age and neurological diseases, the correlation was lost (rs =  − 0.27, p = 0.088, and rs =  − 0.24, p = 0.13).