One factor that the study quantifies is human-capital endowment, meaning the brainpower created by parents, formal education and training, and on-the-job learning.
She said the time factor might explain the study's finding of an increase in deaths among implant patients who did not meet CMS criteria.
Institutional affiliation is also a factor -- a study from his lab found that Berkeley students tended to like their school colors, blue and gold, more than their rival school Stanford's colors, red and white.
However, trouble or substance abuse in the adoptive family is also a risk factor, according to a study of more than 18, 000 adopted children in Sweden.
The Grenoble study authors did not factor in influences the warming oceans would have had upon evaporated water vapor, that primary atmospheric greenhouse gas.
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At that time we proposed that menthol merited study as a possible factor contributing to the dramatically higher rates of smoking-related cancers among African Americans.
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Our study indicates that one explanatory factor was whether a country undertook mass privatisation.
One factor driving this migration, the Demographia study reveals, is differing levels of regulation of land use between regions.
Poverty is a key factor in the regional disparities seen in the study, says Mira Katz, Ph.
The study revolves around a previously fuzzy factor called market impact, which is the extent to which trading tends to push prices against you.
The good news from the study is that while resilience is the key factor to overcoming great obstacles that are all-too-often part and parcel of daily life for the disadvantaged and at-risk population, it is a skill set that can be learned.
And anyone looking to quantify how much any specific factor is to blame could find it a tough issue to study.
CNN: OSHA pushing for new regulations aimed at preventing repetitive motion injuries
"In my study, the model minority pressure is a huge factor, " says Noh, who studied 41 Asian-American women who'd attempted or contemplated suicide.
CNN: Push to achieve tied to suicide in Asian-American women
Citing a 2006 study, they argue that sugary drinks are the biggest factor in rising calorie consumption and obesity levels.
Instead the study emphasizes that population size, not compactness, is the decisive factor.
FORBES: Megacities And The Density Delusion: Why More People Doesn't Equal More Wealth
Weighing the proof that high CRP is a risk factor for heart disease that should be treated will have to wait until the study's results are analyzed and presented.
Experts have a number of hypotheses as to why anxiety and heart disease may be linked, though the new research can't confirm that anxiety -- not some other factor -- is the cause of heart disease and heart attacks in the study.
CNN: Study: Anxiety in youth linked to heart attacks later on
In another study, of men in Sweden, researchers discovered that the leading risk factor for heart attack after smoking was having only a few friends.
FORBES: Promoting Wellness vs. Illness: It's All About We vs. I
It said that a study of US and Japanese youth had suggested playing violent video games was "a significant risk factor for later physically aggressive behaviour".
Their study of more than 7, 000 people suggests exposure to bleach and other chemicals is a factor in one in six cases of adult-onset asthma among British people in their mid-50s .
Researchers don't yet know how to explain these correlations -- and since the study was not a controlled trial, it's not clear whether marijuana or some other factor in marijuana users' lifestyles actually accounted for the beneficial effects.
CytImmune Sciences of Rockville, Maryland, has just begun a study of the efficacy of Aurimune, a solid-gold nanoparticle that carries a dose of tumour necrosis factor (TNF), a substance that has a natural tendency to stick to gold.
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