Centre for Chronic Disease Prevention, Public Health Agency of Canada, Ottawa, Ontario, Canada.
Department of Public Health Sciences, School of Public Health, University of Alberta, Edmonton, Alberta, Canada.
Health Promot Chronic Dis Prev Can. 2016 Oct;36(10):224-230. doi: 10.24095/hpcdp.36.10.03.
Chronic disease rates are produced from the Public Health Agency of Canada's Canadian Chronic Disease Surveillance System (CCDSS) using administrative health data from provincial/territorial health ministries. Denominators for these rates are based on estimates of populations derived from health insurance files. However, these data may not be accessible to all researchers. Another source for population size estimates is the Statistics Canada census. The purpose of our study was to calculate the major differences between the CCDSS and Statistics Canada's population denominators and to identify the sources or reasons for the potential differences between these data sources.
We compared the 2009 denominators from the CCDSS and Statistics Canada. The CCDSS denominator was adjusted for the growth components (births, deaths, emigration and immigration) from Statistics Canada's census data.
The unadjusted CCDSS denominator was 34 429 804, 3.2% higher than Statistics Canada's estimate of population in 2009. After the CCDSS denominator was adjusted for the growth components, the difference between the two estimates was reduced to 431 323 people, a difference of 1.3%. The CCDSS overestimates the population relative to Statistics Canada overall. The largest difference between the two estimates was from the migrant growth component, while the smallest was from the emigrant component.
By using data descriptions by data source, researchers can make decisions about which population to use in their calculations of disease frequency.
慢性病发病率由加拿大公共卫生局的加拿大慢性病监测系统(CCDSS)根据省级/地区卫生部的行政健康数据编制。这些比率的分母是根据健康保险档案中的人口估计数得出的。然而,并非所有研究人员都可以获得这些数据。人口规模估计的另一个来源是加拿大统计局的人口普查。我们研究的目的是计算 CCDSS 和加拿大统计局人口分母之间的主要差异,并确定这些数据源之间潜在差异的来源或原因。
我们比较了 2009 年 CCDSS 和加拿大统计局的分母。CCDSS 分母根据加拿大统计局人口普查数据中的增长成分(出生、死亡、移民和入境)进行了调整。
未经调整的 CCDSS 分母为 34429804 人,比加拿大统计局 2009 年估计的人口高出 3.2%。在 CCDSS 分母根据增长成分进行调整后,两个估计数之间的差异缩小到 431323 人,差异为 1.3%。CCDSS 对人口的估计总体上高于加拿大统计局。两个估计数之间的最大差异来自移民增长成分,而最小的差异来自移民成分。
通过使用数据源的数据说明,研究人员可以决定在计算疾病频率时使用哪个人口。