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Regression toward the mean in fertility research--an empirical study of semen quality
E Bostofte1, M Forrest, B Andersen
1Sperm Analysis Laboratory Health Service Physicians Organization Copenhagen, Denmark.
Andrologia
|January 1, 1987
Abstract:
Regression toward the mean denotes circumstances, where extreme observations tend to normalize at repetition. The phenomenon is caused by random variation and may occur whenever mainly persons with extreme values are subject to repeated examinations. We furnish empirical evidence that the phenomenon may be quantitatively important in fertility research with regard to some, but probably not all indicators of semen quality.