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Cooper TG, Hellenkemper B, Nieschlag E
External Quality Control for Semen Analysis in Germany - Qualitätskontrolle der Deutschen Gesellschaft für Andrologie (QuaDEGA). The First 5 Years
Journal für Reproduktionsmedizin und Endokrinologie - Journal of Reproductive Medicine and Endocrinology 2007; 4 (6): 331-335

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Aktuelles Bild - Abb. 1: Sperm concentration Abb. 2: Sperm concentration Abb. 3: Sperm analysis Abb. 4: Sperm analysis Abb. 5: Sperm analysis
Abbildung 1: Sperm concentration
A Youden plot of sperm concentration. For a given distribution, the results of the assessments of each centre for Sample A (abscissa) is plotted against the assessments of the same centre for Sample B (ordinate). The target ranges for the concentration in each sample (provided by reference centres) is shown between the dotted lines on each axis and they overlap to define the target window (solid line). The positions of points outside the target window indicate random errors (R) or systematic errors (S). The graph is thus divided into 9 areas and Ranks are awarded for falling within the target window (Rank 1), for having random errors (Rank 2 in R2), systematic errors (Ranks 3 in S3) and extreme random errors (Rank 4 in R4).
 
Sperm concentration
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Abbildung 1: Sperm concentration
A Youden plot of sperm concentration. For a given distribution, the results of the assessments of each centre for Sample A (abscissa) is plotted against the assessments of the same centre for Sample B (ordinate). The target ranges for the concentration in each sample (provided by reference centres) is shown between the dotted lines on each axis and they overlap to define the target window (solid line). The positions of points outside the target window indicate random errors (R) or systematic errors (S). The graph is thus divided into 9 areas and Ranks are awarded for falling within the target window (Rank 1), for having random errors (Rank 2 in R2), systematic errors (Ranks 3 in S3) and extreme random errors (Rank 4 in R4).
 
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