Clinical Trial Service Unit and Epidemiological Studies Unit, University of Oxford, Oxford, United Kingdom.
Int J Cancer. 2010 Dec 15;127(12):2918-27. doi: 10.1002/ijc.25517.
The Cancer Incidence in Five Continents (CI5) series comprises nine volumes that bring together peer-reviewed results from population-based cancer registries worldwide. The aim of each is to make available comparable data on cancer incidence from as wide a range of geographical locations as possible. In addition, the existence of long time series of data allows the evolution of risk in different populations over time to be studied. The CI5 I-IX database brings together the results from all nine volumes, spanning a period of some 50 years. In addition, unpublished annual data, with more diagnostic detail, are made available for many cancer registries with 15 or more years of recent data. We describe the construction and composition of the CI5 databases, and provide examples of how they can be used to prepare tables and graphs comparing incidence rates between populations. This is the classical role of descriptive statistics: to allow formulation of hypotheses that might explain the observed differences (geographically, over time, in population subgroups) and that can be tested by further study. Such statistics are also essential components in the planning and evaluation of cancer control programmes.
《五大洲癌症发病率》（CI5）系列由九卷组成，汇集了全球基于人群的癌症登记处的同行评审结果。每一卷的目的都是提供尽可能广泛的地理区域的癌症发病率的可比数据。此外，长期的数据集允许研究不同人群的风险随时间的演变。CI5 I-IX 数据库汇集了所有九卷的结果，跨越了大约 50 年的时间。此外，对于具有 15 年或以上最近数据的许多癌症登记处，还提供了具有更多诊断详细信息的未发表的年度数据。我们描述了 CI5 数据库的构建和组成，并提供了如何使用它们来编制表格和图表以比较人群之间的发病率的示例。这是描述性统计的经典作用：提出可能解释观察到的差异（地理上、随时间变化、在人口亚组中）的假设，并可以通过进一步的研究来检验这些假设。此类统计数据也是癌症控制计划规划和评估的重要组成部分。
