TREM2 and Alzheimer disease: When restricting the sample to subjects who were 65 years or older, the results of the regression analysis confirmed that CSF sTREM2 levels were significantly higher in SNAPs than in the control group (P = 0.004) and in MCI‐AD than MCI‐noAD (P < 0.0001), suggesting that the group differences in CSF TREM2 levels are not due to age differences.