Displaying results 1 - 2 of 2
-
What is the Value of a Positive Syndromic Surveillance Signal?
Content Type: Abstract
One criterion for evaluating the effectiveness of a surveillance system is the system’s positive predictive value. To our knowledge few studies have described the positive predictive value of syndromic surveillance signals… read more… departments (EDs) in King County. EDs send data on all visits that occurred the previous day. Aberrations in … we requested follow-up (positive predictive value 28.1%); 26/61 reports were not otherwise reported to Public Health. … by law. The primary limitation of this study is that we did not analyze signals that didn’t result in follow-up. … -
Systematic Comparison of Algorithms Used in Syndromic Surveillance
Content Type: Abstract
Varied approaches have been used by syndromic surveillance systems for aberration detection. However, the performance of these methods has been evaluated only across a small range of epidemic characteristics. Objective… read more… visits per day. We then simulated epidemics by creating all possible combinations of 3 different parameters: … syndrome. RESULTS Overall, timeliness was similar for all algorithms, with time to detection ranging between 2 and … after the start of the outbreak. When averaged across all outbreak parameters, the GLM had the best sensi- tivity …