The percentage of teenage girls in the USA getting pregnant to full term has dropped to a record low in 2010, a new report issued by the CDC (Centers for Disease Control and Prevention), titled informed this week, as did the birth rate for most females of reproductive age. In 2010 the...
in 2015, for example, there were 141 million births compared to just 57 million deaths. In addition, a large percentage of the world’s population lives in urban areas, often at extremely high population densities. In experiments, whenmammalsare placed in crowded conditions the age of sexual ...
The sex ratio at birth (SRB) may be patterned by maternal condition and/or environmental stressors. However, despite decades of research, empirical results from across the social and biological sciences are equivocal on this topic. Using longitudinal ind
As a result, a comparison group of 18-year olds in a DD analysis is contaminated because it includes a large proportion of girls who were exposed to the PI law during pregnancy when they were 17 years of age. Similarly, a falsification test in which the birth rates of 18- or 19-year...
The technology for birth spacing has been revolutionized so that there are now safe and effective contraceptive methods widely available at reasonable cost in industrialized and developing countries (Table 6.4). Birth control is a public health issue and responsibility. Table 6.4. Percentage of married...
amounting to 126.5 compared to second season. The chance of giving birth to a male newborn during the months outside the heating season is over 45% higher. These results were statistically significant (Table7). Figure1presents the SSR and the percentage of births for both sexes, highlighting ...
Another limitation of the study was the high proportion of mothers lost to follow up, and the relatively high percentage of missing birth outcome data. Furthermore, the study was conducted at a specialized antenatal clinic which may not be representative of the general population. Information on ...
of Social Medicine, Post-graduate Program in Epidemiology, Federal University of Pelotas, Pelotas, Brazil and 2Department of Food Science and Nutrition, California Polytechnic State University, San Luis Obispo, CA, USA Background: Rapid weight gain in childhood may increase the risk of chronic ...
TABLE 6.4.Percentage of Married Women Using Some Form of Contraception, World Regions, 1990–1997, 1997–2005, 2006–2010 Region1990–19971997–20052006–2010 Sub-Saharan Africa152423 Middle East and North Africa465345 South Asia384651 Latin America and Caribbean647174 ...
The African pygmy phenotype stems from genetic foundations and is considered to be the product of a disturbance in the growth hormone–insulin-like growth factor (GH–IGF) axis. However, when and how the pygmy phenotype is acquired during growth remains unknown. Here we describe growth patterns ...