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The magnitude or degree by which one quality or quantity differs from another of the same kind.
alveolar-arterial oxygen d. the d. or gradient between the partial pressure of oxygen in the alveolar spaces and the arterial blood: P(A-a)02. Normally in young adults this value is less than 20 mm Hg. See also alveolar gas equation.
arteriovenous carbon dioxide d. the d. in carbon dioxide content (in ml per 100 ml blood) between arterial and venous blood.
arteriovenous oxygen d. the d. in the oxygen content (in ml per 100 ml blood) between arterial and venous blood.
A-V d. abbreviation for arteriovenous difference of concentration of a substance.
cation-anion d. anion gap
individual d.'s in clinical psychology, deviations of individuals from the group average or from each other.
light d. 1. the d. in light sensitivity of the two eyes; 2. brightness difference threshold
standard error of d. a statistical index of the probability that a d. between two sample means is greater than zero.
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