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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 ?
Cross presentation of the cerebrum, cerebellum, and brainstem of the Zikainfected brain (A) and age-matched control (B).
We used the Wilcoxon test and Fisher's exact test to compare the delay time and abnormality of menstrual cycles, respectively, of the exposure group and the age-matched controls.
Calculating the Fisher linear discriminant for the AD and age-matched control groups and adjusting for zero cutoff gives
SALT LAKE CITY -- The inner and outer layers of the retina were found to be significantly thinner in patients with Parkinson's disease, compared with those layers in normal age-matched controls in a study conducted at the SUNY Downstate Medical Center in Brooklyn, NY
In a second experiment, neuroimaging studies were conducted on 15 BPD patients and 15 age-matched controls when shown pictures from the Thematic Apperception Test (TAT).
Two sheep were cloned from embryonic or fetal cells and showed telomere shortening of approximately 10-15% compared to age-matched controls.
Blair, a medical statistician, both at the University of Bristol (England) and their associates investigated 325 infants who died of SIDS and 1,300 age-matched controls for possible risk factors and interactions.
The researchers assessed 166 subjects aged 18-27 years who had been hospitalized at birth in a single neonatal intensive care unit and 172 age-matched control subjects born at term (N.
Trimmer, PhD, associate professor of neurological research at the UVA School of Medicine, showed that a single, brief treatment with a 810 nm low level, near-infrared laser increased for two-hours the velocity of mitochondrial movement in cells taken from patients with sporadic Parkinson's disease, speeding it up to levels comparable to cells from a disease-free, age-matched control group.
The study included 259 women diagnosed with a first, invasive breast cancer by the time they were 40 years old during 1990-1995 in the South Sweden Health Care Region; 245 of these women were included in the analysis, as well as three age-matched control subjects for each case.
The study included 259 women who were diagnosed with a first, invasive breast cancer by the time they were 40 years old during 1990-1995 in the South Sweden Health Care Region; 245 of these women were included in the analysis, as well as three age-matched control subjects for each case.
The association was so strong in an age-matched control study of 58 women with polycystic ovary syndrome and 106 healthy controls that Dr.