Kaplan-Meier curves for development of cognitive diagnosis depending on CSF Aβ42 status (A) Development of Alzheimer's dementia and dementia with Lewy bodies during follow-up in the group with low baseline CSF Aβ42 levels compared with the group with normal levels. (B) Development of cognitive impairment (AD, DLB, VaD, or MCI) during follow-up in the group with low baseline CSF Aβ42 levels compared with the group with normal levels. n = 44. Abbreviations: CSF, cerebrospinal fluid; Aβ42, β-amyloid 42; AD, Alzheimer's disease; DLB, dementia with Lewy bodies; MCI, mild cognitive impairment.