# median

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Related to median nerve: median nerve test, median nerve injury

## median.

1 In statistics, a type of averageaverage,
number used to represent or characterize a group of numbers. The most common type of average is the arithmetic mean. See median; mode.
. In a group of numbers as many numbers of the group are larger than the median as are smaller. In the group 4, 5, 6, 9, 13, 14, 19, the median is 9, three numbers being larger and three smaller. When there is an even number of numerals in the group, the median is usually defined as the number halfway between the middle pair. 2 In geometry, the line segment connecting any vertex of a triangle to the midpoint of the opposite side; the three medians of a triangle intersect in a single point, called the median point, or centroid. The median of a trapezoid is the line segment connecting the midpoints of the nonparalled opposite sides.

## median

see MEASURES OF CENTRAL TENDENCY.
Collins Dictionary of Sociology, 3rd ed. © HarperCollins Publishers 2000
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

## Median

in geometry, the line segment joining a vertex of a triangle to the midpoint of the opposite side. The three medians of a triangle are concurrent. Their common point is called the centroid of the triangle. The centroid of a triangle cut out of material of uniform density is the center of gravity. It is also the center of gravity of a system of three equal masses situated at the vertices of the triangle. The medians of a triangle divide one another in the ratio 2:1 reckoning from the vertex to the base.

## Median

in probability theory, one of the characteristics of the distribution of values of a random variable. For a random variable X with continuous distribution function F(x), the median m is defined as the root of the equation

The random variable X assumes values larger than m with probability ½ and values smaller than m with the same probability.

In mathematical statistics, the median of an ordered sequence of n quantities x1x2 ≤ • • • ≤ xn is either xk, if n is odd and equal to 2k + 1, or (xk + xk+1)/2, if n is even and equal to 2k. As an estimate of the median for independent observations of a random variable X, we take the median of the ordered sequence constructed from the results of the observations.

## median

[′mē·dē·ən]
(mathematics)
Any line in a triangle which joins a vertex to the midpoint of the opposite side.
The line that joins the midpoints of the nonparallel sides of a trapezoid. Also known as midline.
(science and technology)
Located in the middle.
(statistics)
An average of a series of quantities or values; specifically, the quantity or value of that item which is so positioned in the series, when arranged in order of numerical quantity or value, that there are an equal number of items of greater magnitude and lesser magnitude.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

## median

1. Biology of or relating to the plane that divides an organism or organ into symmetrical parts
2. Geometry
a. a straight line joining one vertex of a triangle to the midpoint of the opposite side
b. a straight line joining the midpoints of the nonparallel sides of a trapezium
3. Canadian the strip, often covered with grass, that separates the two sides of a highway
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
[14] reported that an enlargement of the median nerve in the proximal carpal tunnel in combination with longitudinal compression of the nerve was highly prognostic for CTS.
Determination of the median nerve residual latency values in the diagnosis of carpal tunnel syndrome in comparison with other electrodiagnostic parameters.
While the cross-sectional area of the median nerve was not significantly different in the proximal region of the transverse carpal ligament (p>0.05) between the diabetic and control groups, it was significantly different beneath and in the distal region of the transverse carpal ligament (p<0.05).
When the recipient nerve was the median nerve, the muscle strength recovery rate after CC7 nerve transfer was 0.50 (95% CI : 0.39-0.61), and the sensory recovery rate was 0.56 (95% CI : 0.50-0.63).
(40) Results considered to be abnormal include: an absolute sensory latency > 3.7 msec, a difference of > 0.4 msec between values obtained for the median nerve and those obtained for the radial or ulnar nerve, a motor conduction latency > 4.0 msec, and an incremental change of 0.4 msec in the palmar serial sensory study after controlling for the patient's age and limb temperature.
In one descriptive cross-sectional study, only short-term (3 month) post-operative DASH scores were collected and analysed after 14 subjects underwent ulnar nerve decompression at the elbow with subcutaneous anterior transmission and median nerve decompression at the carpal tunnel.
However, none of the aforementioned case reports had acute median nerve neuropathy associated with the volar DRUJ injury.
In 1 case open reduction was essential and ulnar nerve was released 2 months after trauma and in 1 case 1 month after fracture median nerve release was done.
Accordingly, in this study, we aimed to evaluate the effect of acupuncture on median nerve CSA and to explore the correlation between clinical/electromyographic and ultrasonographic changes after acupuncture treatment in patients with CTS.
More strenuous repetitive motions, such as using a jackhammer, heavy drills or other machinery, can cause CTS, as can traumatic injuries that affect the median nerve. Also, research suggests that certain chronic medical conditions, such as diabetes, obesity, hyperthyroidism (overactive thyroid) and rheumatoid arthritis, may increase the risk of CTS.
The electrophysiological examination revealed sensory and motoring demyelinating and axon lesions in both median nerve, especially in the right hand, which supported the diagnosis of CTS.

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