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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.