Ogden
.pdf
Edward Ogden & Henry Swofford
Disclaimer: Henry Swofford is a Director of BAC-Tracker Intl.
Edward Ogden is a member the Faculty Advisory Board with no pecuniary interest
• Toxicologists are frequently faced with questions involving estimation of
oBAC from given ingestion
oIngestion required to reach measured BAC
• Widmark Formula 1932 |
BAC |
= |
G − ( β * t ) |
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W * τ
o Accounts for distribution and elimination
o Single gender factor for body water - ♀ = 0.55 ♂ = 0.68 o Fails illustrate degree of uncertainty
•Zuba and Piekoszewski (2004) - using the Widmark formula alone will result in variance when other
subject data are not included. “Uncertainty in Theoretical Calculations of Alcohol Concentration” , 17th International Conference on Alcohol, Drugs and Traffic Safety (ICADTS). T2004: Glasgow.
Snohomish County District Court, #7036A-09D, Memorandum Decision on motion to suppress [expert testimony] 23 March 2010
• Widmark - simple estimates of body water as a proportion of total mass
•Watson
•Forest
•Seidl
•Ulrich
τ = ♀ 0.55 or ♂ 0.68
τ watson ( female ) = 0.29218 + |
12.666*H |
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2.4846 |
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τ |
Watson ( male ) = 0.39834 + |
12.725*H |
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0.11275* A |
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2.8993 |
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τ Forest ( female ) = 0.8736 − |
0.0124*W |
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H 2 |
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τ |
Forest ( male ) = 1.0178 − |
0.012127*W |
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H |
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τ Seidl ( female ) = 0.31223 − 0.006446 * W + 0.4466 * H
τSeidl ( male ) = 0.31608 − 0.004821 * W + 0.4632 * H
τUlrich ( male ) = 0.715 − 0.00462 * W + 0.22 * H
•Posey and Mozayani suggested that these methods be combined to give an average τ
The Estimation of Blood Alcohol Concentration: Widmark Revisited. Forsic. Sci. Med. Pathol., 2007. 3(1): p. 33-39.
