TABLE 4.

Comparison of LPA results for cryopreserved PBMC stored at −70°C versus PBMC stored in liquid nitrogen before shipment on dry ice

StimulantnMedian SI ratio (1st quartile; 3rd quartile)aP valueb
Tetanus160.97 (0.55; 2.14)0.90
Candida161.17 (0.69; 1.57)0.82
PWM161.44 (1.08; 2.48)0.02
  • a The SI of aliquots stored at −70°C were divided by the SI of aliquots stored in liquid nitrogen. The data are the medians of the SI ratios.

  • b Wilcoxon matched-pair signed-rank test.