Association between plasma lipocalin-2 and neuropsychological measures. All subjects regardless of preclinical AD status were included in the analysis. (A-D) Plasma lipocalin-2 levels were not associated with MMSE (age- and sex-adjusted, beta coefficient –0.0629, P = .42), WMS-R-LM I (age- and sex-adjusted, beta coefficient −0.0142, P = .46), WMS-R-LM II (age- and sex-adjusted, beta coefficient –0.0186, P = .831), and Trail Making A scores (age- and sex-adjusted, beta coefficient 0.145, P = .14). (E) Plasma lipocalin-2 levels were associated with Trail Making B scores (age- and sex-adjusted, beta coefficient 0.228, P = .014). Scatterplots with individual values and unadjusted regression lines are shown. Abbreviations: AD, Alzheimer's disease; MMSE, Mini–Mental State Examination; WMS-R-LM, Wechsler Memory Scale–Revised, Logical Memory.