The findings come from a study in which researchers have tried to untangle the effect of the age at first period from other complex factors that might affect time spent in education, revealing that youngwomenwho start their periods earlier may spend less time in the education system. Previous r...
Women who start periods early likelier to have girlsBotha, Leslie CarolHoly Hormones Journal
Serotonin transporter polymorphism predicts waking cortisol in young girls. Psychoneuroendocrinology 2009; 34: 681–686. 15 Wüst S, Kumsta R, Treutlein J, Frank J, Entringer S, Schulze TG et al. Sex-specific association between the 5-HTT gene-linked polymorphic region and basal cortisol ...
In girls, the signs to watch for are the development of the breasts, the growth of pubic hair or underarm hair, a change in the appearance of the external genitals, and the beginning of menstrual periods. In boys, watch for enlargement of the testicles or penis, the appearance of pubic ...
Short-term activation of the inflammatory response during sensitive periods in early life may affect the brain development and later microglia and neuroendocrine reactivity (Figure 2). Panel (b) portrays potential biological and behavioral mechanisms through which response to childhood trauma could lead ...
We performed additional subgroup analyses on (1) critical periods of exposure (i.e. in utero and early life exposure); (2) sex differences; and (3) low level InAs exposure (wAs<100μg/L). We specified all subgroup analyses a priori. We deemed a meta-analysis inappropriate due to the ...
her risk for breast cancer. Thus, women who begin menstruating later or enter menopause early have a lower risk of breast cancer. And young women who are physically active are more likely to start their periods later and less likely to have regular cycles when they begin their periods. ...
aGirls, but not boys, had some permanent maxillary canines, second premolars and mandibular and maxillary second molars as early as at the age of 6.5–8 years. Permanent teeth of both the first and the second transitional periods were already emerging at the age of 3.5–5 years and 6.5–...
They found that flies that slept for very short periods of time —— about 72minutes a day —— still lived about as long as flies that slept for longer time. One of the flies slept for just 4 minutes each day. This has led the researchers to wonder if sleep is less necessary than ...
a group of kids with time-traveling watches. The watches transport them to different historical periods where they work to stop a Time Pirate from altering the past. Each book presents a new adventure, from finding the Wright brothers’ lost airplane propeller to ending disputes in Ancient ...