Fig. 2From: Determinants of patient survival during the 2014 Ebola Virus Disease outbreak in Bong County, LiberiaNumber of suspected, probable, or confirmed cases of EVD. After the identification of persons of interest (n = 607), suspected and probable cases were subjected to diagnostic testing with RT-PCR for EBOV when available (n = 321). For those with test results, the likelihood of being RT-PCR positive given demographic and exposure related factors was assessed using simple logistic regression (blue shaded polygon*); the 172 RT-PCR negatives were excluded from further analysis. Cases confirmed by RT-PCR (n = 149) and suspected and probable EVD cases not tested by RT-PCR (n = 286) were submitted to review of survival histories for completeness, excluding 44 that were lost to follow-up at 30 days. This left 391 suspected, probable, or confirmed EVD cases for survival analysis using Cox proportional hazards regression and Kaplan-Meier survival functions to assess the risk of short-term mortality within 30 days of symptom onset (orange shaded polygon**)Back to article page