"But they have to be a little bit careful to overstate that." Both political parties also see the continuing congressional debate on health care reform as a key factor in next year's midterm elections.

VOA: standard.2009.10.23

You measure health and you measure a factor like diet, you measure other factors that might be related as well.

你衡量其健康及饮食,还有很多其他可能有关的因素

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

The paper's authors tried to take into account other factors, but they admit it may not have been entirely possible to quantify differences in, for example,the recipient's health, which can be a big factor in the success of a transplant.

VOA: standard.2010.07.14

Not only is how we finance health care an important factor that influences our freedom ranking, but our freedom ranking is also tied to health outcomes of great importance.

FORBES: Study Finds US Slips in Freedom, Health

Mrs Brundtland said public health was a key factor in improving poverty and had been underfunded.

BBC: WHO launches anti-poverty drive

Of 2, 000 adults polled in February, 20 percent said food health is an important factor when they order dinner.

CNN: How to dine out without hurting your heart