并注重纵向研究设计。
但所得的研究结果还需采用纵向研究设计在更多种类的、更大规模的职业样本中加以检验。
But all outcome of our study need tested in more occupation groups and in larger samples according to longitudinal experimental design.
实验设计，安排及参与者：随机选取意大利托斯卡纳社区的698名年龄在65岁以上的老人进行纵向研究。
Design, Setting, and Participants: Longitudinal study of 698 community-living persons 65 years or older who were randomly selected from a population registry in Tuscany, Italy.
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