Sentences with phrase «when studying population»

In the past, researchers could either predefine a demographic model or try to be model - flexible when studying population genetics.

When the study population was divided into four groups based on their serum vitamin D levels, the group with the lowest levels had over a twofold risk of chronic headache in comparison to the group with the highest levels.

Not exact matches

The article is slightly confusing in that it uses the term «country» in the 6th paragraph to refer to the entire United Kingdom when discussing the Pew study's estimates of the percentage of the population which is Muslim after having previously been discussing only England and Wales in conjunction with the popularity of boy's names.

When similar populations of women are studied, home birth has consistently produced a perinatal death rate 2 - 3x that of hospital birth.

«Our study shows that young knees are more prone to re-injury than the adult population when compared to other research in this area - and is the first study to examine the incidence and risk factors for further ACL injury in a solely juvenile population over the long term,» said lead author Justin Roe of North Sydney Orthopaedic & Sports Medicine Centre.

While multiple studies have shown that the pregnancy rate is slightly lower when replacing a single embryo, as compared to 2, the pregnancy rate is still very high in a selected patient population (< 35 with extra blastocysts to freeze).

The increased socioeconomic inequalities in breastfeeding observed in the intervention group supports the argument that population intervention strategies could inadvertently exacerbate, rather than mitigate, socioeconomic inequalities, particularly when the intervention aims to change individual behaviours rather than targeting «upstream» structural changes.25 Our results are also compatible with an observational study from Brazil reporting that breastfeeding rates increased first among the socioeconomically better - off, followed by increases among the poor, over a 20 - year period of active breastfeeding promotion campaigns in Brazil.26

When logistic models were stratified by the presence or absence of hypertensive disease, only maternal age older than 34 years (odds ratio [OR], 1.4; 95 % confidence interval [CI], 1.0 - 2.0), pregnancy - associated plasma protein - A of the 95th percentile or less (OR, 1.9; 95 % CI, 1.2 - 3.1), and alpha fetoprotein of the 95th percentile or greater (OR, 2.3; 95 % CI, 1.4 - 3.8) remained statistically significantly associated for abruption.In this large, population - based cohort study, abnormal maternal aneuploidy serum analyte levels were associated with placental abruption, regardless of the presence of hypertensive disease.

A population - based study of 58,113 multiparous women yielded similar results when the duration of the second stage was greater than 2 hours (31).

A study published by the group today says that Britain is among the best performing countries when it comes to the number of road deaths per head of the population.

In 2015, he came to the University for Development Studies, Navrongo Campus for NPP TESCON programme when I was NDC TEIN president and preached a very terrible message by asking Ghanaians to make sacrifices like the people of Ivory Coast did some years ago and that «a country smaller in size and population compared to Ghana, which had endured bloody dispute in their last election, resulting in the loss and displacing of thousands of lives, had, in a short period, turned around their fortunes.

Even when Facebook downplayed the importance of the echo chamber effect in their own Science study, the data was based on a tiny snapshot of users (i.e. those who declared their political ideology or about 4 % of the total Facebook population).

When you have just a single example of an object to study, you can not tell if it is an oddball or the archetype of a whole population.

«It's shocking to see how few articles discussed risk to the general population, and when they did, they typically characterized risk as low,» said Pascale, who studies the social construction of risk and meanings of risk in the 21st century.

Dr Allan Debelle, who conducted the study as part of his PhD under the supervision of Dr Rhonda Snook at the University of Sheffield, said these results suggest that mate choice can be an important driver of the evolution of motor performance, «Our research shows that when, at each generation, females are given a choice among several mates performing energetically costly courtship, the motor performance of males in that population can respond to this selection process and progressively improve.»

Researchers were examining the genomes of these mammoths for a separate study into mammoth population genetics when they noticed that their dead remains skewed male: About 70 % of those caught in natural traps carried a Y chromosome.

Geneticist Iosif Lazaridis of Harvard Medical School in Boston, who studies how and when ancient populations mixed, calls the new results «a big accomplishment.»

When Thailand flooded a rainforest to build a dam in 1986, it created an opportunity to study how isolation affects mammal populations.

When UCSF scientists pooled the results of five population - based studies of smokers, they found that smokers who used e-cigarettes were about a third less likely to quit smoking than those who did not use e-cigarettes.

In a 2013 laboratory study, physicist Jeff Gore of the Massachusetts Institute of Technology in Cambridge took a step in that direction by predicting when yeast colonies were about to die of stress because of low population densities.

But when he searched a database of 500 Mexican genomes — initially assembled for biomedical studies — and sought genetic variants more common in Asian populations, he found a surprise.

College students make a convenient study population when you're a researcher at a university.

When researchers like Barzilai have looked for genes that might account for the extreme longevity of the centenarians they study, they have typically found that the genes that stand out in one long - lived population do not do so in others.

Earlier studies used DNA to claim the moa population was 3 million at 4000 BC and just 159,000 when humans arrived.

When they analyzed the results of the experiment, the LMU researchers discovered that their study population found articles actually or putatively written by humans to be more readable than computer - generated texts.

Other examples abound: In England, when deer were kept out of one study site, moth populations quadrupled.

«Clarification based on rigorous research studies will permit researchers to identify the conditions under which depression can influence substance abuse treatment retention and outcomes, which in turn will help to specify when depression needs to be directly addressed with this population of young people,» explained the researchers.

The researchers studied the wolves when the reintroduced population was just starting out and few in number, and again when the wolves had spread throughout the area and were to be found at higher densities.

«The responses of fish species to extreme weather events will need to be considered when planning management strategies to ensure efforts are appropriately targeted to maintain key population segments and critical evacuation routes,» said Dave Secor, the study's co-author at the University of Maryland Center for Environmental Science's Chesapeake Biological Laboratory.

One potential clue came when lead study author Miho Nakajima of The Rockefeller University discovered a population of neurons in the medial prefrontal cortex that express the oxytocin receptor.

When we standardized all the estimates to a common scenario — i.e., the same exposure to screening, and a similar target population, period of screening, and duration of follow - up — the magnitude of the difference between studies dropped from twentyfold to about fourfold.»

A small oil pond could trap thousands of dragonflies when they are swarming, Horváth says, and nobody has studied yet what impact that would have on the insect population.

«When we look forward several decades, climate models predict such profound loss of Arctic sea ice that there's little doubt this will negatively affect polar bears throughout much of their range, because of their critical dependence on sea ice,» said Kristin Laidre, a researcher at the University of Washington's Polar Science Center in Seattle and co-author of a study on projections of the global polar bear population.

«When you are able to study a similar population with similar risk factors, you get much more reliable results.»

«Our analysis demonstrates the need to assess multiple variables simultaneously when studying ecogeographical rules in a broadly distributed species like the common treeshrew, as multiple factors may have influenced how populations evolved.»

One earlier study suggests the results may be depressing when they come: in a Scottish prison almost one in twenty prisoners were found to be infected — well above the average levels of the British population.

For this reason, we recommend that when designing an experiment, the initial screening step should consider the biological units (i.e., species, subspecies, populations) that are as close as possible to the target units to be studied.»

So, despite the fact that we have this first descriptive approach, more research needs to be done by incorporating new variables, by expanding the sample and by adapting the ranges of intensity of the population studied; while guaranteeing equality, that would enable us to complement the comparison with respect to the demands made on both genders when playing a football match.

«This ongoing study provides us information about these unique birds that was essentially lost when the populations disappeared in the wild and will help us with our ongoing efforts to recover this species.»

The problem is that we don't know how much damage the predators do during winter, when the lemming population grows fastest, as, unsurprisingly, researchers do most of their field studies in the summer.

More than 90 percent of people tested in population studies had detectable levels of BPA and compounds produced when it is metabolized by the body in their urine.

«This is particularly important when you want to look at a species» ability to cope with change,» said Jennifer Pistevos, a master of research student at the Marine Biological Association, who studied clone populations of Celleporella hyalina, a tiny organism she found to have an amazing ability to reproduce in both more acidic and warmer water conditions.

The study revealed that in the model system chosen by Opitz and colleagues the winning side becomes apparent at a very early stage in the growth of the population, when the numbers of cells are still relatively small.

Relationships between spotted owl populations and climate was complex and variable, but rangewide, the study results suggested that survival of young spotted owls and their ability to become part of the breeding population increased when winters were drier.

It is important to note that the age of the people in the study when they were diagnosed was high and may not represent the MS population as a whole.

Because most clinicians are likely to see smokers at times when a quit date in the next month is not planned, the current study indicates that prescription of varenicline with a recommendation to reduce the number of cigarettes smoked per day with the eventual goal of quitting could be a useful therapeutic option for this population of smokers.

This latest study, which cross-linked 23,201 female cancer survivors from the Scottish Cancer Registry with hospital discharge records, revealed 6627 pregnancies among the cancer survivors when nearly 11,000 would have been expected in a comparable matched control group from the general population.

In previous studies, Knight and other researchers have found distinct populations of neurons within a region of the brain called the hypothalamus that can trigger thirst and signal when an animal should start and stop drinking.

«These unique data showing a wide range of animals thriving within miles of a major nuclear accident illustrate the resilience of wildlife populations when freed from the pressures of human habitation,» says Jim Beasley, a study co-author at the University of Georgia.

When looking for the rare genetic variants involved, geneticists can be thrown off track by the existence of subgroups within the populations they are studying.