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The growth and proliferation rates of cells vary within the meristem, with higher activity at the periphery compared to the central region. The term meristem was first used in 1858 by Swiss botanist Carl Wilhelm von Nägeli (1817–1891) in his book Beiträge zur Wissenschaftlichen Botanik ("Contributions to Scientific Botany"). [2]
Growth charts have been constructed by observing the growth of large numbers of healthy children over time. The height , weight , and head circumference of a child can be compared to the expected parameters of children of the same age and sex to determine whether the child is growing appropriately.
This file is a work of the Centers for Disease Control and Prevention, part of the United States Department of Health and Human Services, taken or made as part of an employee's official duties. As a work of the U.S. federal government , the file is in the public domain .
For many types of garments, size cannot be adequately described by a single number, because a good fit requires a match between two (or sometimes three) independent body dimensions. This is a common issue in sizing jeans. Ad hoc sizes have changed with time, due to changing demographics and increasing rates of obesity.
Due to natural variation, individuals pass through the Tanner stages at different rates, depending in particular on the timing of puberty.Among researchers who study puberty, the Tanner scale is commonly considered the "gold standard" for assessing pubertal status when it is conducted by a trained medical examiner. [5]
Short title: Birth to 36 months: Boys, Head circumberence-for-age and Weight-for-length percentiles: Image title: CDC Growth Charts: United States: Author
The median (50th percentile) growth curves for males and females 0−20 years in the United States. The study of height is known as auxology. [11] Growth has long been recognized as a measure of the health of individuals, hence part of the reasoning for the use of growth charts. For individuals, as indicators of health problems, growth trends ...
Growth curve model: [2] Let X be a p×n random matrix corresponding to the observations, A a p×q within design matrix with q ≤ p, B a q×k parameter matrix, C a k×n between individual design matrix with rank(C) + p ≤ n and let Σ be a positive-definite p×p matrix. Then