Skip to main content

Advertisement

Table 2 Mean and standard deviation (SD) of G6PD enzyme activity (in U/gHb) at Day 0 and at thaw date

From: Cryopreservation of glucose-6-phosphate dehydrogenase activity inside red blood cells: developing a specimen repository in support of development and evaluation of glucose-6-phosphate dehydrogenase deficiency tests

  Cryopreservation time intervals (days) specimens
  0 to 30 31 to 89 90 to 200 Sum (0 to 200)
Number of cryopreserved specimens (Number of corresponding fresh blood specimens) 21 (14) 20 (20) 10 (10) 51 (31)
Mean a (SD) G6PD activity at Day 0 4.57 (4.22) 4.40 (3.80) 4.74 (4.05) 4.10 (3.90)
Mean b (SD) G6PD activity at thaw date 4.04 (4.33) 4.55 (4.68) 3.91 (3.93) 3.87 (4.41)
Mean difference (SD) between Day 0 & thaw date 0.53 (0.46) −0.15 (0.31) 0.84 (0.09) 0.23 (1.05)
P value* <0.001 0.629 <0.001 0.233
  1. Meana (SD) G6PD activity at Day 0 is the mean of the activities in fresh blood from which cryopreserved aliquots were used over a given time interval. Meanb (SD) G6PD activity at thaw date is the mean of the activities in the cryopreserved specimens thawed over a given time interval.
  2. *Paired t test P value.