如果有一个单一的、普遍接受的指标，用以衡量美国人的经济和社会福利，那将是极其方便的。
It would be enormously convenient to have a single, generally accepted index of the economic and social welfare of the people of the United States.
方法：在循证医学指导下对福利院369名老年人中3年间发生骨折的病人进行X线摄片和骨密度、骨生化代谢指标测定。
Methods: Using X-ray; bone mineral density index and bone biochemistry measure 369 cases of old fracture who have been fracture in three years through means of Evidence-based medicine.
方法：在循证医学指导下对福利院369名老年人中3年间发生骨折的病人进行X线摄片和骨密度、骨生化代谢指标测定。
Methods: Using X-ray; bone mineral density index and bone biochemistry measure 369 cases of old fracture who have been fracture in three years through means of Evidence-based medicine.
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