By Francis E. Johnston, Alex F. Roche, Charles Susanne (auth.), Francis E. Johnston, Alex F. Roche, Charles Susanne (eds.)
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Extra info for Human Physical Growth and Maturation: Methodologies and Factors
Example text
Secular changes in height make it clear that attained height is of primary importance for the assessment of a population's nutritional status. Weight for height represents a second important indicator, while body composition (derived from anatomical and bio-chemical data) is an essential part of the measurement of nutritional status. Weight for height is a first step in the assessment of body composition. Many attempts have been made to establish mathematical formulae (indices) that relate weight to height.
The weight is recorded in gm for infants and in hgm for older children. Head circumference. A narrow measuring tape, calibrated in mm, is applied around the head at its greatest circumference: over the glabella and the os occipitale. An infant should be held sitting upright. Sexual maturation. The beginning of adolescence coincides with the first sign of development of one or more sex characteristics. The end of adolescence is indistinct. For example, a schoolgirl of 11 years of age, who has just reached menarche (age at first menstruation), can scarcely be considered physically and mentally adult although in many cultures girls marry very so on after menarche.
It must be emphasized that rounding off by the observers has to be avoided. This may lead to systematic errors. In the present survey, we have asked the examiner to give his personal (subjective) impression in terms of tall, small, lean, J. C. VAN WIERINGEN 30 stout or "nothing particular". Unusual data have to be accepted if they match the impression of the observer. Data Processing One has to decide to what extent one will use a computer. In 1965, we obtained the frequency distributions of height and weight according to sex and age by sorting them.