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

Table 1 Human female serum FSH (IU/L): assay summary statistics after less than 12 months frozen storage (short term and intermediate storage times)

Lab_{storage time}	Mean (SD)	Median (SE)	Min, Max	Q25, Q75
Lab A_{0 days}	7.31 (3.29)	7.60 (0.85)	2.20, 14.50	5.15, 9.05
Lab A_{45 days}	7.00 (3.02)	7.40 (0.78)	2.10, 12.90	4.70, 8.90
Lab B_{45 days}	6.07 (2.57)	6.47 (0.66)	1.95, 10.53	4.20, 6.72
Lab C _{45 days}	7.29 (3.01)	7.92 (0.78)	2.18, 12.80	5.00, 9.12
Lab B_{10.5 months}	6.33 (2.79)	6.60 (0.72)	2.10, 11.40	4.55, 7.05
Lab C_{10.5 months}	7.29 (2.96)	7.79 (0.76)	2.31, 12.00	4.95, 9.22

n = 15 samples
SD standard deviation, SE standard error, MIN minimum value, MAX maximum value, Q25 25^th percentile, Q75 75^th percentile.

ISSN: 1477-7827