Volume 26, Number 1—January 2020
Research Letter
Use of Ambulance Dispatch Calls for Surveillance of Severe Acute Respiratory Infections
Figure
![Observed and predicted weekly proportion of ambulance dispatch calls with respiratory syndromes from the multivariate models. The gray area represents the proportion that the model identifies as the baseline (i.e., attributable to unidentified factors); the colored area is the proportion of ambulance dispatch calls with respiratory syndromes attributed to influenza-like illness. The black line is the 5-week moving average of the observed proportion of respiratory syndromes. A) Overall; B) patien](/eid/images/18-1520-F1.jpg)
Figure. Observed and predicted weekly proportion of ambulance dispatch calls with respiratory syndromes from the multivariate models. The gray area represents the proportion that the model identifies as the baseline (i.e., attributable to unidentified factors); the colored area is the proportion of ambulance dispatch calls with respiratory syndromes attributed to influenza-like illness. The black line is the 5-week moving average of the observed proportion of respiratory syndromes. A) Overall; B) patients <15 years of age; C) patients 15–64 years of age; D) patients >65 years of age; E) calls during office hours; F) calls during out of office hours; G) calls of urgency level A1.
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