Statistical analyses in disease surveillance systems
Open Access
- 14 November 2008
- journal article
- conference paper
- Published by Springer Science and Business Media LLC in BMC Proceedings
- Vol. 2 (S3), S7
- https://doi.org/10.1186/1753-6561-2-s3-s7
Abstract
The performance of disease surveillance systems is evaluated and monitored using a diverse set of statistical analyses throughout each stage of surveillance implementation. An overview of their main elements is presented, with a specific emphasis on syndromic surveillance directed to outbreak detection in resource-limited settings. Statistical analyses are proposed for three implementation stages: planning, early implementation, and consolidation. Data sources and collection procedures are described for each analysis. During the planning and pilot stages, we propose to estimate the average data collection, data entry and data distribution time. This information can be collected by surveillance systems themselves or through specially designed surveys. During the initial implementation stage, epidemiologists should study the completeness and timeliness of the reporting, and describe thoroughly the population surveyed and the epidemiology of the health events recorded. Additional data collection processes or external data streams are often necessary to assess reporting completeness and other indicators. Once data collection processes are operating in a timely and stable manner, analyses of surveillance data should expand to establish baseline rates and detect aberrations. External investigations can be used to evaluate whether abnormally increased case frequency corresponds to a true outbreak, and thereby establish the sensitivity and specificity of aberration detection algorithms. Statistical methods for disease surveillance have focused mainly on the performance of outbreak detection algorithms without sufficient attention to the data quality and representativeness, two factors that are especially important in developing countries. It is important to assess data quality at each state of implementation using a diverse mix of data sources and analytical methods. Careful, close monitoring of selected indicators is needed to evaluate whether systems are reaching their proposed goals at each stage.Keywords
This publication has 9 references indexed in Scilit:
- Pandemic Influenza Threat and Preparedness1Emerging Infectious Diseases, 2012
- Challenges in the implementation of an electronic surveillance system in a resource-limited setting: Alerta, in PeruBMC Proceedings, 2008
- Outbreak detection through automated surveillance: A review of the determinants of detectionJournal of Biomedical Informatics, 2007
- Syndromic surveillance on the epidemiologist's desktop: making sense of much data.2005
- Algorithms for rapid outbreak detection: a research synthesisJournal of Biomedical Informatics, 2005
- A simulation model for assessing aberration detection methods used in public health surveillance for systems with limited baselinesStatistics in Medicine, 2005
- Evaluation of reporting timeliness of public health surveillance systems for infectious diseasesBMC Public Health, 2004
- Framework for evaluating public health surveillance systems for early detection of outbreaks: recommendations from the CDC Working Group.2004
- Evaluation of Syndromic Surveillance Systems - Design of an Epidemic Simulation ModelPublished by American Psychological Association (APA) ,2004