The spurious correlation between concentration and creatinine-corrected concentration in urine

Brown, Simon, Cooke, Delwyn G., Blackwell, Leonard F., and Simcock, David C. (2019) The spurious correlation between concentration and creatinine-corrected concentration in urine. International Journal of Open Information Technology, 7 (2). pp. 1-7.

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Abstract

The use of urinary analytes to monitor physiological processes relies on making the correct measurement. Three alternatives are commonly contemplated: concentration, creatinine-corrected concentration and excretion rate. Of these, the latter is the most reliable, but is perceived by some to be difficult to measure. This has led to the more frequent reliance on concentration and one of the justifications for this is the reported linear relationship between the concentration and the creatinine-corrected concentration. We show that this correlation is spurious in that the magnitude of the correlation coefficient depends on the ratio of the standard deviations of the creatinine and analyte concentrations. As an example urinary analyte we use pregnanediol (Pd) which is an important tool for women wishing to monitor their own fertility. Urinary Pd concentration is not a reliable substitute for creatinine-corrected Pd concentration or the Pd excretion rate.

Item ID: 57006
Item Type: Article (Research - C1)
ISSN: 2307-8162
Keywords: creatinine correction, menstrual cycle, spurious correlation, urinary analyte concentration
Copyright Information: Statement on publisher website: "This journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge [...] This work is licensed under a Creative Commons Attribution 4.0 International License."
Date Deposited: 18 Feb 2019 01:18
FoR Codes: 06 BIOLOGICAL SCIENCES > 0601 Biochemistry and Cell Biology > 060101 Analytical Biochemistry @ 100%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920114 Reproductive System and Disorders @ 100%
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