To investigate the effect of survey design, specifically the number of items and recall period, on estimates of household out-of-pocket and catastrophic expenditure on health.

研究家庭预算外健康开支和大病治疗开支的估算调查设计(尤其是项目数量和回忆期)的效果。

youdao

Methods: Census method and sampling survey method were both used to investigate the related data of the second-class large medical equipments in Henan province.

方法：采用普查法和抽样调查法相结合，对河南省乙类大型医用设备的相关资料进行了调查。

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Methods a questionnaire survey covered 224 community health service stations established in 2000 or before in 61 cities was carried out to investigate the income and expense.

方法对61个市区所属的2000年及以前建立的224个社区卫生服务站的收支情况进行问卷调查。

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The researchers used a national long-term survey of adolescent health to investigate the relationship between media use and depression.

VOA: special.2009.02.11

American researchers used a national long-term survey of adolescent health to investigate the link between media use and depression.

VOA: special.2009.03.10

Members of the Iraq Survey Group were continuing to examine hundreds of documents and would investigate any new leads, the U.S. intelligence official said.

CNN: Official: U.S. calls off search for Iraqi WMDs

Deputy State Department spokesman Adam Ereli said the multinational force in Iraq and the Bush administration's Iraq Survey Group had been ordered to investigate the disappearance of the explosives.

CNN: Tons of Iraq explosives missing

So Dr. Mark Daniel DeBoer, an associate professor of pediatric endocrinology at the University of Virginia School of Medicine, and his colleagues turned to a large database of 10, 700 children in the Early Childhood Longitudinal Survey, Birth Cohort to investigate the relationship between the type of milk children drank and their body mass index (BMI).

CNN: Drinking skim milk may not lower child obesity risk