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1. journals.sagepub.com › doi › pdfWidmark calculations and their uncertainty - SAGE Journals

   journals.sagepub.com › doi › pdf

   For Widmark’s equation, this is the correct equation to employ for estimating the combined uncertainty (standard deviation). Based on the assumed values presented in table 1 of my paper, I obtained a com-bined uncertainty of 0.0255 g/100 mL which corres-ponds to a CV of 21.2%. Searle is correct in that.

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3. wsp.wa.gov › breathtest › docsWidmark's Equation 03-07-2002 (67 KB PDF)

   wsp.wa.gov › breathtest › docs

   During the early part of this century, E.M.P. Widmark, a Swedish physician, did much of the foundational research regarding alcohol pharmacokinetics in the human body. In addition, he developed an algebraic equation allowing one to estimate any one of six variables given the other five.

   • File Size: 68KB

   • Page Count: 4

4. www.sciencedirect.com › science › articleImproving uncertainty in Widmark equation calculations ...

   www.sciencedirect.com › science › article

   Sep 1, 2017 · Using the standard deviations that are known for the values v (volume), z (concentration), d (density) and common general error propagation (GEP) methodology it is possible to determine the standard deviation of the amount of pure alcohol consumed (A) using Eq.

   • Author: Peter D. Maskell, R. Alex Speers, R. Alex Speers, Dawn L. Maskell

   • Publish Year: 2017

5. www.ncbi.nlm.nih.gov › pmc › articlesAlcohol calculations and their uncertainty - PMC

   www.ncbi.nlm.nih.gov › pmc › articles

   Blood alcohol calculations originated in the 1920s with the pioneering work of Widmark, 1 who noticed, whilst developing the micro-analysis of alcohol, that the results were always higher than might be expected from a simple dilution calculation.

   • Author: John Searle
   • DOI: 10.1177/0025802414524385

   • Publish Year: 2015
   • Publication: Med Sci Law. 2015 Jan; 55(1): 58-64.

6. rke.abertay.ac.uk › ws › filesImproving uncertainty in Widmark equation calculations ...

   rke.abertay.ac.uk › ws › files

   6 calculated that the mean density (± Standard deviation (SD)) of ethanol is 0.78974 ± 7 0.00059 g/cm 3 (% coefficient of variance (CV) = 0.07481). Thus, it would be more 8 accurate to use these values both in calculations using the Widmark factor and for 9 calculation of uncertainty when using the Widmark equation. 10 11 3. Variation on the ...

   • Author: Peter D. Maskell, R. Alex Speers, R. Alex Speers, Dawn L. Maskell

   • Publish Year: 2017

7. www.sciencedirect.com › science › articleEstimating the uncertainty associated with Widmark's equation ...

   www.sciencedirect.com › science › article

   Oct 2, 2007 · Uncertainty estimates are presented that rely on methods of general error propagation compared to a method developed by Widmark. Assuming reasonable variable and uncertainty estimates, the error propagation method yielded for N = 10.4 drinks, a combined uncertainty (standard deviation) of 1.3 drinks (CV = 12.3%).

8. People also ask

   Is Widmark's equation correct for estimating com-bined uncertainty (standard deviation)?

   • For Widmark’s equation, this is the correct equation to employ for estimating the combined uncertainty (standard deviation). Based on the assumed values presented in table 1 of my paper, I obtained a com-bined uncertainty of 0.0255 g/100 mL which corres-ponds to a CV of 21.2%.

   Widmark calculations and their uncertainty - SAGE Journals

   journals.sagepub.com/doi/pdf/10.1177/0025802414567974

   See all results for this question

   How did Widmark calculate a standard deviation?

   • Widmark, appreciating the importance of uncertainty, derived separate equations for men and women to estimate one standard deviation estimates in A as follows : (8) for men: S A = 0.015625 A 2 + 0.050176 ( A − 0.68 C t p) 2 (9) for women: S A = 0.01 A 2 + 0.021904 ( A − 0.55 C t p) 2 The derivation of these equations is given in Appendix A.

   Estimating the uncertainty associated with Widmark's

   www.sciencedirect.com/science/article/pii/S0379073806006943

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   What are Widmark calculations?

   • Widmark Calculations. calculations performed in forensic toxicology. As with all measurements and estimates that arise both in and from calculations there is a level of “uncertainty”. Knowing the thus a better estimate of the true result . The uncertainty of measurement is analysis are that they are being asked to evaluate.

   Improving uncertainty in Widmark equation calculations

   rke.abertay.ac.uk/ws/files/8789887/Maskell_ImprovingUncertaintyInWidmarkEquationCalculations_Author_2017.pdf

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   How does Widmark's equation calculate BAC?

   • According to Widmark’s equation, an individual’s BAC is determined by multiplying the ounces of alcohol consumed by a constant factor, 3.75 for men and 4.7 for women, and then dividing by their weight. In particular, the Widmark equation overestimates the BAC by up to 50–100% or more for cases involving heavy drinking.

   Widmark Equation - SpringerLink

   link.springer.com/referenceworkentry/10.1007/978-981-99-9283-6_2926

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   How do you calculate a forward Widmark?

   • Using the nomenclature of the main paper the Forward Widmark calculation is: where C is the BAC at the relevant time Uncertainty in any of the input parameters will add to the uncertainty in C, that is the calculated BAC. Writing S with a suffix to denote the standard deviation of each parameter, the uncertainty (standard deviation) of the BAC is:

   Alcohol calculations and their uncertainty - PMC - National Center for

   www.ncbi.nlm.nih.gov/pmc/articles/PMC4361698/

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   Does Widmark's equation include alcohol absorption?

   • Widmark’s equation has been employed in several different forms. Searle includes the proportion of alcohol absorption as an additional factor. When doing so the uncertainty of these add-itional terms needs to be included as well. Finally, it is important that this discussion and investigation of Widmark’s equation continue.

   Widmark calculations and their uncertainty - SAGE Journals

   journals.sagepub.com/doi/pdf/10.1177/0025802414567974

   See all results for this question

9. link.springer.com › referenceworkentry › 10Widmark Equation - SpringerLink

   link.springer.com › referenceworkentry › 10

   • Cached

   Jan 1, 2024 · According to Widmark’s equation, an individual’s BAC is determined by multiplying the ounces of alcohol consumed by a constant factor, 3.75 for men and 4.7 for women, and then dividing by their weight. In particular, the Widmark equation overestimates the BAC by up to 50–100% or more for cases involving heavy drinking.