title: How to appropriately choose observed indexes.
abstract: Observed index is a very important element in a research design, because it is a specific reflection of the effects of research factors on the research subjects and is indispensable in any research. Generally, there are two types of observed indexes: the indexes that reflect natural attributes, habits or states of the research subjects and the indexes that reflect the effects of different drugs or treatments on research subjects. This article mainly introduces the definition, characteristics, selection and observation of research indexes and the major and minor indexes.
authors.affiliation: Academy of Military Medical Sciences, Beijing 100850, China. lphu812@sina.com
authors.forename: Liang-ping
authors.initials: LP
authors.lastname: Hu
authors.forename: Xiao-lei
authors.initials: XL
authors.lastname: Bao
authors.forename: Xue
authors.initials: X
authors.lastname: Guan
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
mesh_terms: D005163:Factor Analysis, Statistical; D012107:Research Design