Fig. 1.
New and cumulative Ebola virus disease cases at the time of the four surveys of Ebola knowledge, attitudes and prevention practices, by region, Sierra Leone, 2014–2015
Notes: For each survey date, the illustration shows the number of Ebola virus disease cases confirmed in the previous 42 days in each of the four regions, with the cumulative total in parentheses. The western region includes two districts: Western Area Urban and Western Area Rural districts. Across the four surveys, 258 enumeration areas (i.e. clusters) were sampled from a total of around 10 000 enumeration areas in the country. As 24 enumeration areas were sampled more than once during randomization, 234 unique clusters were visited in the four data collection rounds, which represent approximately 2.5% of the national number of enumeration areas in the 2004 census. On average, 100 households (range: 50–120) were selected in each enumeration area.
