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Table 1 Main results of 6 years and 7 surveys for the seminal biomarkers EQA program

From: External quality assessment program for biochemical assays of human seminal plasma: a French 6-years experience

Surveys 2014 2015 2016 2017 2018-A 2018-B 2019 Median
Citrate
 Median (IQR), mmol/L 27.60 (5.27) 24.00 (2.96) 26.60 (0.87) 29.1 (0.1) 27.59 (4.42) 28 (4.06) 28.80 (2.3) 27.6
 CD, % 11.05 5.54 1.77 0.34 10 4.64 4.34 4.64
 Number of laboratories 6 4 5 5 6 7 6 6
 Consistent resultsa (%) 3 (50) 3 (75) 5 (100) 4(80) 3 (50) 4 (57) 5 (83) 75b
Zinc
 Median (IQR), mmol/L 2.02 (0.14) NA 1.70 (0.14) 2.31 (0.30) 2.20 (0.57) 2.00 (0) 2.25 (0.26) 2.11
 CD, % 3.96 NA 7.65 10.82 11.8 0 8.44 8.04
 Number of laboratories 5 1 3 3 4 5 5 4
 Consistent resultsa (%) 5 (100) NA 3 (100) 3 (100) 3 (75) 5 (100) 4 (80) 100b
Fructose
 Median (IQR), mmol/L 14.43 (3.2) 17.76 (3.23) 14.65 (1.00) 16.20 (0.80) 15.00 (1.29) 16.00 (2.45) 16 (1.78) 16
 CD, % 19.2 5.80 4.44 2.47 1.23 6.25 6.25 5.8
 Number of laboratories 7 6 5 5 6 7 6 6
 Consistent resultsa (%) 2 (29) 2 (33) 5 (100) 5 (100) 4 (67) 5 (71) 4 (67) 67 b
α-1,4 Glucosidase
 Median (IQR), UI/L 20 (2.2) 17.65 (4.4) 17.60 (2.96) 21.85 (2.60) 19.16 (3.21) 20 (0.75) 18.75 (4.5) 19.16
 CD, % 4 12.42 11.70 6.63 10.8 2.5 11.98 10.8
 Number of laboratories 5 6 5 4 6 6 6 6
 Consistent resultsa (%) 4 (67) 4 (67) 3 (60) 3 (75) 5 (83) 5 (83) 5 (83) 75 b
  1. aConsistent results are the overall compliant and acceptable results i.e. scored B-, A-, A+ or B+
  2. bCalculated from % of consistent results
  3. CD Coefficient of dispersion, IQR Interquartile range, NA Not available