Table 2.

Spearman correlations between plasma p-tau217 and CSF Aβ42/Aβ40

Plasma p-tau217	CSF Aβ42/Aβ40 R (p-value, adjusted/unadjusted)
All (n = 100)
Cond 1: thaw at RT, NC	− 0.515 (< 0.001/ < 0.001)
Cond 2: thaw at RT, C	− 0.636 (< 0.001/ < 0.001)
Cond 3: thaw on ice, NC	− 0.607 (< 0.001/ < 0.001)
Cond 4: thaw on ice, C	− 0.652 (< 0.001/ < 0.001)
Aβ+ (n = 50)
Cond 1: thaw at RT, NC	− 0.215 (0.172/0.133)
Cond 2: thaw at RT, C	− 0.394 (0.010/0.005)
Cond 3: thaw on ice, NC	− 0.284 0.079/0.046)
Cond 4: thaw on ice, C	− 0.406 (0.007/0.003)
Aβ− (n = 50)
Cond 1: thaw at RT, NC	0.230 (0.162/0.108)
Cond 2: thaw at RT, C	0.073 (0.615/0.615)
Cond 3: thaw on ice, NC	0.210 (0.172/0.143)
Cond 4: thaw on ice, C	0.105 (0.511/0.468)

Data are shown as Spearman correlation coefficients (p-values, adjusted/unadjusted) with significant results highlighted in bold. Abbreviations: Aβ⁺ Amyloid-β positive, Aβ⁻ Amyloid-β negative, C Centrifugation, Cond Condition, CSF Cerebrospinal fluid, NC Non-centrifugation, RT Room temperature