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Table 2 Characteristics of cases and contacts (13th April – August 31st 2015)

From: Use of a mobile application for Ebola contact tracing and monitoring in northern Sierra Leone: a proof-of-concept study

  Paper Daily Reporting Form ECT Smartphone App
Cases Contacts Cases Contacts
Characteristic N (%) N (%) N (%) N (%)
Total 25a 408 18b 646
Age
 < 5 yrs 4 (16%) 51 (13%) 2 (13%) 123 (19%)
 5–14 yrs 2 (8%) 119 (29%) 2 (13%) 141 (22%)
 15 – 44 yrs 13 (52%) 188 (47%) 9 (56%) 272 (42%)
 ≥ 45 yrs 6 (24%) 46 (11%) 3 (19%) 110 (17%)
 Median (IQR) 26 (20–44) 18 (7–30) 28.5 (18–40) 20 (6–35)
Sex
 Male 10 (40%) 205 (50%) 9 (50%) 317 (49%)
 Female 15 (60%) 203 (50%) 9 (50%) 329 (51%)
Mortality status
 Alive 21 (84%) 407c (100%) 11 (61%) 646 (100%)
 Dead 4 (16%) 7 (39%)
Chiefdom     
 1 5 (28%) 72 (11%)
 2 24 (96%) 376 (92%) 4 (22%) 70 (11%)
 3 10d (2%)
 4 1 (6%) 65 (10%)
 5 5 (28%) 159 (25%)
 6 3 (17%) 270 (42%)
 7 1 (4%) 32 (8%)
  1. aFour cases followed using the paper Daily Reporting Form had no contacts
  2. b Data on age and sex were available for only 16 cases (not for two ‘secret burials’)
  3. c Data on 407 contacts was available. All contacts were alive
  4. dThe 10 contacts in this Chiefdom came from a case that occurred in Chiefdom 2