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Spaghetti plots showing 3-level within-subjects comparisons.
(A), Tube type and freeze–thaw. First column: Sarstedt 0.5 mL tube, frozen; second column: Sarstedt 2.5 mL tube, fresh; third column: Sarstedt 2.5 mL tube, frozen. (B), Tube type and run date. First column: Sarstedt 0.5 mL tube, run date A; second column: Sarstedt 0.5 mL tube, run date B; third column: Fisher 1.5 mL tube, run date A. Note: tTau analyte values not available for study A.
