Fig. 5

Survival of suspected, probable, or confirmed EVD cases by age and sex. The Kaplan-Meier survival functions for the time period 30 days after the onset of EVD symptoms is presented for suspected, probable, or confirmed EVD cases. Survival by age group (left panel) was stratification into the following age groups: >20 years (group 1, n = 74), 20 to 30 years (group 2, n = 72), 30 to 40 years (group 3, n = 67), 40 to 50 years (group 4, n = 79), and >50 years (group 5, n = 82), which appear as a gradient of gray lines from lightest to darkest (groups 1 to 5, respectively). Survival by sex (right panel) included 216 males (blue line) and 172 females (pink line). The equality of survival functions assessed by the log-rank test was significantly different by age group (P = 0.01) and sex (P = 0.002)