NEFL and Mental deterioration: Stratified analysis showed for both proteins that higher levels were associated with faster cognitive decline in the SCD/MCI A– group (St.B[SE] – 0.26[0.08], p < 0.01 for NfL, –0.38[0.11], p < 0.01 for 14-3-3 ζ/δ), but not in the other two groups.