Sentences with phrase «based twin study»

A population - based twin study of major depression in women: the impact of varying definitions of illness

Not exact matches

Breastfeeding in preterm and term twins — maternal factors associated with early cessation: a population - based study

This concept is primarily based on a 1977 study published in the New England Journal of Medicine that showed women who got pregnant shortly after stopping oral contraceptives were twice as likely to have twins.

Based on a three - year study with intensive measurements at three different locations in Aarhus, they divide the grass pollen season into three periods, as shown in the graph below: a twin peak profile during the early season, a single evening profile in the middle season and a single midday profile during the late season.

As the study was a cohort of twins, the researchers were also able to examine the genetic basis of ADHD.

The idea is based in part on studies that show identical twins to have more similar levels of life satisfaction than non-identical twins, and suggests that although your level of happiness may occasionally be thrown off by major life events, it will always return to a set level within two years.

«These twin studies show that there's a genetic basis for the differences in how easy or enjoyable children find learning.»

Latvala and his colleagues used data from two ongoing population - based longitudinal studies of Finnish twins, FinnTwin12 (FT12), of twins born 1983 - 1987, and FinnTwin16 (FT16), of twins born 1975 to 1979.

Although the universality of expressions and differences in facial musculature argue for a hereditary basis, only a few studies with twins have examined that hypothesis.

Early twins studies were based on fewer than 50 twin pairs and could not detect any greater similarities in the microbiomes of identical twins compared with those of fraternal twins.

Furthermore, by conducting the Mars 160 mission in the form of twin studies, dubbed Mars Desert 80 (MD80) and Mars Arctic 80 (MA80) with the same crew operating in the Arctic and the desert, the program will provide important information as to how well Mars analog missions held in the desert can serve in place of far more expensive Mars surface simulations carried out in the Arctic, and to what extent conclusions drawn from desert - based research need to be adjusted to reflect that which would likely be obtained under more stressful Arctic field conditions.

Researchers are studying twins in the hopes of uncovering the genetic basis of mosquito attractiveness.

This may explain why, in a study of over a thousand women eating plant - based diets, vegan women had one - fifth the number of twins compared with vegetarians and omnivores.

Drawing on behavioural genetic research from around the world, including the UK - based Twins» Early Development Study (TEDS), one of the largest twin studies in the world, her research shows that genetic influence is not the same as genetic determinism and that the environment matters at least as much as genes.

Heritability estimates for obsessive - compulsive symptoms based on twin studies are 0.25 — 0.45 for adults and 0.45 — 0.65 for children [3], [8].

Twin pairs (N = 1350), aged 8 to 16 years, in the general population - based Virginia Twin Study of Adolescent Behavioral Development were assessed using the Child and Adolescent Psychiatric Assessment interview administered separately to both twins and both parents.

To be clear, twin studies alone establish that the «alternative perspective» of an «innate gender identity» arising from prenatally «feminized» or «masculinized» brains trapped in the wrong body is in fact an ideological belief that has no basis in rigorous science.

For example, some have found significant differences between children with divorced and continuously married parents even after controlling for personality traits such as depression and antisocial behavior in parents.59 Others have found higher rates of problems among children with single parents, using statistical methods that adjust for unmeasured variables that, in principle, should include parents» personality traits as well as many genetic influences.60 And a few studies have found that the link between parental divorce and children's problems is similar for adopted and biological children — a finding that can not be explained by genetic transmission.61 Another study, based on a large sample of twins, found that growing up in a single - parent family predicted depression in adulthood even with genetic resemblance controlled statistically.62 Although some degree of selection still may be operating, the weight of the evidence strongly suggests that growing up without two biological parents in the home increases children's risk of a variety of cognitive, emotional, and social problems.

Not only do adoption studies support a genetic basis for personality disorders that are shown to have a relation to criminality, but twin studies as well.

The first two types discussed were based on studies from human twins, whereas the third type was formulated based on research using mice.

Using a genetically informed design based on 266 monozygotic and dizygotic twin pairs, this study examined whether the expression of genetic risk for aggressive and non-aggressive antisocial behavior varies depending on the peer group's injunctive norms (i.e., the degree of acceptability) of each type of antisocial behavior.

Prior research has established the influence of maternal depression on the child's behavioral and emotional health3, 27,28 and its relevance for pediatric practice.29, 30 Several studies have analyzed the independent effects on children of mothers» and fathers» mental health, but few have examined the more clinically relevant question of how the mental health of parents jointly influences child outcomes.16, 31,32 The largest study of the joint effects of mothers» and fathers» mental health on children was a population - based study of twins and their parents.16 Similar to our results, the combination of maternal and paternal depression was associated with the largest increase in children's depressive symptoms.

Using a genetically informed design based on twins, this study examined the potential moderating role of classroom anti-bullying policies and teachers» perceived self - efficacy in handling bullying situations in regard to the additive and interactive effects of peer victimization and genetic vulnerability on anxiety symptoms.