Results 211 to 220 of about 17,732 (260)
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Secular Trends in Pubertal Development
Hormone Research in Paediatrics, 2002<i>Objective:</i> To describe the secular trend in pubertal development in relation to the secular trend in height. <i>Methods:</i> Literature review of cross-sectional, longitudinal and twin studies. <i>Results:</i> Globally, there is a secular trend in adolescent growth for an increased mean final height at ...
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SECULAR TRENDS IN TWINNING RATES
Journal of Biosocial Science, 2006Based on national data from civil birth registration systems, this paper provides an overview of trends in the twinning birth rates in fifteen developed countries. Patterns and differentials in such rates across populations are described, and trends over time are given.
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2013
From the mid- to late 20th century, average birthweight increased in many countries, including the United States. However, more recent data now suggest that mean birthweight has begun to decline. The most recent US data indicate that in 2008, compared with 1990, about half as many babies were macrosomic at birth (≥5,000 g), whereas there was a 17 ...
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From the mid- to late 20th century, average birthweight increased in many countries, including the United States. However, more recent data now suggest that mean birthweight has begun to decline. The most recent US data indicate that in 2008, compared with 1990, about half as many babies were macrosomic at birth (≥5,000 g), whereas there was a 17 ...
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1992
Abstract Changes in the prevalence rate at birth of neural tube defects with time have been reported in almost all well-studied areas. These include long-term trends over 10 or more years and short-term changes over a few years. Seasonal variations are considered separately, in Chapter 7.
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Abstract Changes in the prevalence rate at birth of neural tube defects with time have been reported in almost all well-studied areas. These include long-term trends over 10 or more years and short-term changes over a few years. Seasonal variations are considered separately, in Chapter 7.
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Research on secular trends in auxology
Anthropologischer Anzeiger, 1990Current status of research on secular trends in growth and maturation is considered from several perspectives. The need to define secular trends as positive, negative or absent is initially discussed. Positive secular trends, i.e., increases in size and earlier maturation, characterize the majority of the auxological literature.
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Secular Trend in Reported Sperm Counts
Andrologia, 2009Claims that there has been a recent secular decline in splerm counts have been disputed. Protaglonists on both sides of the discussion have based their arguments on data from a few large samples at different times and (mostly) in different places. It is not disputed that the differences between the mean counts in the various samples are statistically ...
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Minerva pediatrica, 2003
The aim of our study was to evaluate the age of the onset of pubertal characteristics in a population of Northern Italy and to compare our data with the pubertal staging scale defined by Tanner in 1976. These observations may help us to verify if even in Italy there is a positive secular change in sexual maturation, as has been observed in many ...
BONA, Gianni +2 more
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The aim of our study was to evaluate the age of the onset of pubertal characteristics in a population of Northern Italy and to compare our data with the pubertal staging scale defined by Tanner in 1976. These observations may help us to verify if even in Italy there is a positive secular change in sexual maturation, as has been observed in many ...
BONA, Gianni +2 more
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Pubertal development in girls: secular trends
Current Opinion in Obstetrics & Gynecology, 2006To provide an overview of recent studies from the US and other parts of the world that provide conflicting data as to whether there has been a secular trend for earlier onset of puberty and menarche from about 1960 to the present.Studies from the US suggest a decrease in the age of onset of puberty over the past 40 years of between 0.5 and 1.0 years ...
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The secular trend: History and prospects
Human Physiology, 2009The origin of the term secular trend and the history of study of this phenomenon are analyzed. Throughout most of the 20th century, the direction of changes was the same in most countries: improvement of socioeconomic conditions was accompanied by an increase in the physical parameters of the human body, primarily, the indices of longitudinal growth ...
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Secular trends in newborn sex ratios
Early Human Development, 2014A wide variety of factors have been shown to influence the male to female ratio at birth, which invariably displays a male excess. This paper will review and amplify recent work by the author, with specific references to individual countries, regions and entire continents in order to provide a global overview of this subject.
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