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Changes in brain weights during the span of human life: relation of brain weights to body heights and body weights.

More than 20,000 autopsy reports from several general hospitals were surveyed for the purpose of selecting brains without a pathological lesion that had been weighed in the fresh condition. From this number, 2,773 males and 1,963 females were chosen for whom body weight, body height, and cause of death had been recorded. The data were segregated into 23 age groups ranging from birth to 86+ years and subjected to statistical evaluation. Overall, the brain weights in males were greater than in females by 9.8%. The largest increases in brain weights in both sexes occurred during the first 3 years of life, when the value quadruples over that at birth, while during the subsequent 15 years the brain weight barely quintuples over that at birth. Progressive decline in brain weight begins at about 45 to 50 years of age and reaches its lowest values after age 86 years, by which time the mean brain weight has decreased by about 11% relative to the maximum brain weight attained in young adults (about 19 years of age). Computed regression lines for brain weights versus body heights and body weights and for ratios for brain weights to body heights and weights versus age groups show clearly differential rates of change in brain weights which are less affected by sex.

Adolescent↗

[Jena longitudinal study of growth of 0-3 year old children. 1: Average values of body height and body weight, somatograms and percentile values].

Normal values (means +/- s and percentiles) for body height and weight and a somatogram for children from the newborn period up to 3 years determined in 306 children (164 boys and 142 girls) are presented. Beyond the first year of life the children are slightly taller and have a reduced height related body weight in comparison to older standards.

Body Height↗

Body height and body mass as determinants of basal blood pressure in children--The Bogalusa Heart Study.

Body height and body mass as determinants of basal blood pressure in children--The Bogalusa Heart Study. Am J Epidemiol 106:101-108, 1977. Risk factor variables for coronary artery disease were measured in a total biracial community study of 3524 children, ages 5-14 years. Anthropometric variables, serum lipids, and blood pressure (BP) were measured in a rigid randomized design. Blood pressure data were obtained with an automatic recording instrument that avoids excessive pressure readings in obese children by the use of an over-sized arm cuff bladder with a built-in infrasonic transducer. By reducing the anxiety of the child and by taking multiple readings, pressures were obtained that approached published basal levels. A multiple regression analysis showed that all measured variables could account for 39% of the systolic BP variation. Major determinants were based on weight (W) and height (H). The BP levels, when related to H and to a weight-height index (W/H3), suggest a strong influence of H and an additional influence of W/H3 on BP, both consistent and proportionate over the entire ranges of H and W/H3. The total spectrum of observed correlates of BP, resulting from the multiple regression analysis, suggests that the BP measured under basallike conditions increases as the child grows and is proportional to lean body mass and total body mass. Practical criteria for evaluating abnormal blood pressure levels in children should be based on normative values derived from body weight and body height rather than from age.

Adolescent↗

[History of the determination body height from skeletal findings (body height determination for men). The proposed methods of body height determination from skeletal findings since the middle of the 20th century].

A scientific historical review of the procedures of stature estimation according to skeleton finds including a collection of important tables and formulae replacing the troublesome looking for formulae and tables in the scattered publications was still missing. In the 1st part, a collection of estimations published since the middle of the 18th century to the middle of the 20th century is therefore presented. In this part, a collection important procedures of stature estimation published since the middle of our century is given. The presentation follows the chronological succession. A short description of all mentioned base populations is included in the text. A thorough critical anthropological and statistical analysis of base populations and estimations was not intended, because this should be the topic of a separate research.

Age Factors↗

Height, body mass index and mortality: do social factors explain the association?

The aim of the study was to analyse the effects on mortality of body height and body mass index (BMI) in young men, taking into account social and behavioural characteristics in early youth. The study is a 20-year follow-up of all Swedish men (n = 50,465) conscripted for military service in 1969-70. Baseline data on body height and weight as well as interview and questionnaire data on social and behavioural characteristics were linked to mortality data up to the end of 1988. Nine hundred and forty-six men died during the follow-up. We found a significant increase in mortality by decreasing body height; persons below 165 cm had an almost twofold increased mortality compared with those of average height. This association was reduced to the limit of statistical significance when we controlled for social and behavioural characteristics in a multivariate model. Persons with a BMI above 30 had a more than twofold increased mortality compared with those of average BMI. This association remained highly significant in a multivariate model. We thus confirmed previous findings of an inverse association between body height and mortality, but found that this association was almost entirely due to social background factors. The independent association between BMI and mortality may indicate a stronger genetic influence on BMI than on body height.

Adult↗

[Effect of changed conditions on body height and body weight of preschool children in Jena].

This article reports results of an anthropological investigation on pre-school children from 1994. The body height and weight are presented and compared with results of the Jena Longitudinal Study and results of the investigations of school children which are carried out in Jena in relatively regular intervals since 1880. For the increase of the body weight since 1985/86 changes in the nutritional situation of the people from East-Germany are discussed. Other changes in the living conditions influencing the somatic development are analysed.

Body Height↗

[Birth weight of newborn infants in relation to body height and body weight of parents with special reference to duration of pregnancy].

Using the data of the 1985 GDR somatogram standards (birthweight percentiles calculated from 51,570 liveborn singletons) the impact of parental weight and length on the birthweight were calculated. Peristatic factors in combination with the genetic 'anlage' act first of all via maternal weight. Body height and/or length of mother and father are more representative for the genetic constitution. Their impact on neonatal weight seems to be less significant, however statistically calculable. The paternal 'anlage' is relatively modified by the intrauterine environment (maternal constitution).

Birth Weight↗

[Urinary flow in children: correlation with age, body height and body surface area].

Peak flow rate data (Qmax) are important for diagnosis of lower urinary tract obstruction. However, the lack of uroflowmetry studies in children, makes their interpretation difficult. With this aim, we studied 167 boys classified in four groups according to their age (G1: n = 48, 6-7 years; G2: n = 43, 8-9 years; G3: n = 37, 10-11 years; G4: n = 39, 12-14 years). We studied in all children, weight, height, body surface area, peak flow rate (Qmax) and the correspondant urinary volume (Vol). Means and standard deviations of Qmax (ml/sec) were: 15 +/- 5 (G1), 15 +/- 5 (G2), 17 +/- 5 (G3) and 22 +/- 7 (G4) respectively. Corresponding urinary volumes (Vol) (mean standard deviation-in ml) were: G1 = 123 +/- 75; G2 = 122 +/- 79; G3 = 158 +/- 96 and G4 = 162 +/- 101. We found a significant correlation (p < 0,01) between Qmax and Vol in groups G2, G3 and G4; and between Qmax and height in groups G1 and G4. The authors demonstrated a positive correlation between maximum flow and voided volume, and an increase of Qmax with age.

Adolescent↗

Relationship between axial length of the emmetropic eye and the age, body height, and body weight of schoolchildren.

This report assesses the relationship of axial length of emmetropic (without refractive error) eyes to age, height, and weight in 1,600 Croatian schoolchildren. Axial eye lengths were determined by an ultrasonic eye biometry (A scan). Axial length of both eyes increases with age, height, and weight but shows a closer correlation to height and weight than to age. Boys have a significantly longer axial eye length than girls (P < 0.01). Boys or girls of similar or nearing body height and body weight and with emmetropic eyes have close linear measures of anatomic eye structures within their sex, regardless their age. Body height demonstrates the closest correlation to the growth and development of the emmetropic eye.

Adolescent↗

[Spirometric studies in clinically healthy workers in steel mills. I. Effect of age, body height and body weight on the variability of selected ventilation indicators].

Of 2750 examined workers of the Lenin steel mill a group of 520 so called healthy men aged 20-60 has been selected, who had developed chronic specific and inspecific diseases of the respiratory tract, and circulatory diseases during myocardial insufficiency and arterial hypertension. This population underwent tests performed by the F function, test of significance of differences between coefficients of multiple determination in the function of age, growth and body weight, and in the function of: age and height; age and body weight, height and body weight, which allowed to determine the contribution of age, height and body weight in the significance of the following spirometric indices: VC, FEV1%VC, RV, ERV, FRC, RV% TLC, TLC. Age exhibited statistically significant contribution to the total variance of VC, FEV1%VC, RV, ERV, FRC RV%TLC, and insignificant--in case of TLC. Height exhibits significant impace on VC, RV, ERV, FRC, TLC, RV%TLC. Statistically insignificant dependence on height was obtained in case of FEV1%VC. Inclusion of body weight showed a statistically significant explanatory value for VC, RC, ERV, FRC RV%TLC, and insignificant for TLC and FEV1%VC.

Adult↗

[Evaluation of body height and body weight in relation to growth in children in the North Backa region].

INTRODUCTION: Body weight and height in regard to age present an important indicator for evaluation of health status in children. The aim of this study was to evaluate body weight and height in regard to age in children of the North Backa Region (Subotica, Backa Topola and Mali Idos) compared to reference values. MATERIAL AND METHODS: Results of transversal anthropometric measurements performed from 1995-1998 of body weight and body height of 25.790 children aged 1-18 from Health Centers in North Backa Region have been statistically processed by software "CHILD". Body weight and height in regard to age were evaluated by standard deviation, according to international World Health Organization reference values and National Center for Health Statistics (NCHS/WHO). RESULTS: Body weight was established (+2 standard deviation) in 9.33% children, while 1.14% had decreased body weight from -2 standard deviation. Obesity, as well as undernourishment, dominated among children from village Mali Idos. Body height higher than +2 standard deviation was registered in 8.07% children, mostly among boys from Backa Topola. Body height lower than -2 standard deviation was found in 2.10% children of our region. DISCUSSION: Obesity in children aged 1-18, in our region is higher than in the children from UN regions and subregions. Only Russia has worse results generally speaking. In regard to the WHO Global Database of underweight children, we can say that in our children it is hardly present. CONCLUSION: These findings reflect the need for prospective growth monitoring of children in our area and for health improvement through nutrition intervention programs.

Adolescent↗