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Table 2 Human female serum FSH (IU/L): assay to assay comparisons after varying length of storage time at -25 degrees C

From: Inter-laboratory validation of the measurement of follicle stimulating hormone (FSH) after various lengths of frozen storage

Comparison Labs and storage time Mean Percentage Difference (SD)
1 A45 days vs. A0 -4% (0.05)
2 A45 days vs. C45 days +5% (0.03)
3 A0 days vs. C45 days +1% (0.07)
4 A45 days vs. B45 days -12% (0.08)
5 A0 days vs. B45 days -16% (0.09)
6 B45 days vs. B10.5 months +4% (0.05)
7 C45 days vs. C10.5 months 0% (0.04)
8 A0 days vs. C2 yrs -23% (0.13)
9 A0 days vs. B2 yrs -25% (0.20)
  1. SD standard deviation