Shi Jingcheng, Mo Xiankun, Sun Zhenqiu
Department of Epidemiology and Statistics, Central South University, Changsha, China.
Zhong Nan Da Xue Xue Bao Yi Xue Ban. 2012 Feb;37(2):152-5. doi: 10.3969/j.issn.1672-7347.2012.02.007.
Content validity is the degree to which an instrument has an appropriate sample of items for the construct being measured and is an important procedure in scale development. Content validity index (CVI) is the most widely used index in quantitative evaluation. There are 2 kinds of CVI: I-CVI and S-CVI. A method to compute a modified kappa statistic (K*) can be used to adjust I-CVI for chance agreement. S-CVI/UA and S-CVI/Ave are both scale level CVI with different formulas. Researchers recommend that a scale with excellent content validity should be composed of I-CVIs of 0.78 or higher and S-CVI/UA and S-CVI/Ave of 0.8 and 0.9 or higher, respectively. The characteristics and qualifications of the experts, process and main results of content validity evaluation should be reported in scale-related manuscript.
内容效度是指一种工具对于所测量的构念具有适当项目样本的程度，是量表编制中的一个重要程序。内容效度指数（CVI）是定量评估中使用最广泛的指数。CVI有两种：I-CVI和S-CVI。一种计算修正kappa统计量（K*）的方法可用于调整I-CVI以考虑机遇一致性。S-CVI/UA和S-CVI/Ave都是量表水平的CVI，公式不同。研究人员建议，具有优秀内容效度的量表应由I-CVI为0.78或更高以及S-CVI/UA和S-CVI/Ave分别为0.8和0.9或更高组成。在与量表相关的稿件中应报告专家的特征和资质、内容效度评估的过程及主要结果。
