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a. a period of history marked by some feature or characteristic; era
b. (capital when part of a name): the Middle Ages; the Space Age
2. Geology palaeontol
a. a period of the earth's history distinguished by special characteristics
b. the period during which a stage of rock strata is formed; a subdivision of an epoch
3. Myth any of the successive periods in the legendary history of man, which were, according to Hesiod, the golden, silver, bronze, heroic, and iron ages
4. Psychol the level in years that a person has reached in any area of development, such as mental or emotional, compared with the normal level for his chronological age
5. of age adult and legally responsible for one's actions (usually at 18 or, formerly, 21 years)



in humans, a stage of development that is characterized by specific regularities of formation of the organism and personality and by relatively stable morphophysiological and psychological traits. While age is a stage in the biological maturing of the organism, a process controlled by genetic factors, it is also a concrete result and stage of the social-psychological development of the personality and is determined by the conditions of life, training, and upbringing.

The content and form of training and upbringing are historically composed and varied according to age; in their turn they affect the determination of the boundaries and possibilities of a given age. In contemporary pedagogy and developmental psychology, several ages are differentiated with respect to the known relationships of the boundaries: infancy (from birth to one year); pre-preschool, or early childhood (from one to three); preschool (from three to seven); early school age (from seven to ten years); juvenile, or middle school (from ten to 15); and late school, or early youth (15 to 18 years old). Beyond these limits there is no generally accepted classification in the literature; only old age is considered separately. With the increased longevity noted in the 20th century, gerontology and gerontopsychology have arisen as disciplines to study the problems of prolonging the active life of a human being. Each age has a characteristic structure of cognitive, emotional, and volitional properties and qualities; forms of behavior; types of relationships to the environment; and peculiarities of structure and functioning of various organs and systems of the organism. This structure, however, is not invariable: in the 20th century a general acceleration of the physical and mental development of children has been noted. On the other hand, educational theory, in solving the problem of optimizing training, widens the possibilities of age and the boundaries of acquiring knowledge. Training must take into account not only the level of development achieved but also the development perspectives (the concept of “zones of imminent development,” as formulated by L. S. Vygotskii): the teacher must know not only what is present in a child of a given age but also what can be achieved, given certain conditions, by the child in the near future.



Period of time from origin or birth to a later time designated or understood; length of existence.
Any one of the named epochs in the history of the earth marked by specific phases of physical conditions or organic evolution, such as the Age of Mammals.
One of the smaller subdivisions of the epoch as geologic time, corresponding to the stage or the formation, such as the Lockport Age in the Niagara Epoch.


(aerospace engineering)
References in periodicals archive ?
The age-matched control group were recruited from the same geographical area and met the same inclusion and exclusion criteria, except that they had not suffered from a past or present mood or other psychiatric disorder and scored zero on all the items of the measures of depression (see below).
The purposes of this investigation, therefore, were fourfold: (1) to compare the degree of hearing loss and threshold asymmetry in an experimental group of 278 industrial workers who engaged in recreational shooting with those of an age-matched control group of 278 industrial workers who did not shoot; (2) to identify and compare the occupational HPD compliance in the two groups; (3) to examine the influence of age and the number of unprotected and protected firearm noise exposures per year on hearing sensitivity in the experimental group; and (4) to identify STS rates and STS laterality in both groups.
26] found that women with IC in a population-based study were 9 times more likely to have a diagnostic code for child abuse (which includes sexual abuse, but also physical and emotional abuse) than age-matched controls.
They compared these brain scans with those of an age-matched control group of eight people without writer's cramp.
Law, MD, and her colleagues at the Vanderbilt Eye Institute, looked for plasma (blood) biochemical markers, or biomarkers, that would indicate systemic oxidative stress and an inflammatory response in 57 patients with AMD and in an age-matched control group.
1A]ARs showed a significant increase in latency periods (compared to age-matched control animals) preceding the initial myoclonic jerk and the progression to the first generalized seizure or tonic/clonic seizure.
For every dyspeptic patient, a sex- and age-matched control was recruited from a convenience sample of asymptomatic persons from the local community of Nakuru by public advertisement.
Research: The effect of active absorbable algal calcium (AAA Ca) with collagen and other matrix components on aging-associated skin changes and backache and joint pain was tested in a case-controlled study of 40 test subjects and 40 age-matched control subjects (mean age, 65 years) complaining of backache and knee joint pain due to osteoarthritis, spondylosis deformans, and/or osteoporosis.
We identified all patients who had either planned or unplanned admissions, and we compared the latter with an age-matched control group consisting of patients who were not admitted.
Group estimates were obtained by pooling all measurements for AD and age-matched control.
When they compared the images of 82 patients who had type 1 diabetes for 15 to 25 years with minimal complications to those of 36 age-matched control subjects who did not have diabetes, they discovered lower levels of gray matter density in the group with diabetes.