From: An integrated multi-study analysis of intra-subject variability in cerebrospinal fluid amyloid-β concentrations collected by lumbar puncture and indwelling lumbar catheter
Aβ40
Aβ42
Time × draw group
Slope
p value
1
0.41
0.56
1.02
0.25
2
1.6
0.12
0.79
0.45
3
4.12
<0.001*
4.32