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Table 3 Time from laboratory confirmation to first visit for the 16 confirmed cases, plus two secret burials

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

Case Chiefdom Contacts registered (N) Contacts visited (N) Date/time of case confirmation Case confirmation to registration (hours) Case registration to contact assignment (median hours) Contact assignment to first visit (median hours) Case confirmation to first visit (median hours) Case-specific delaying factors and comments
Total   556 384   18.0 23.4 22.8 70.2  
1 1 19 19 06/06/2015 19:23 19.99 29.73 22.77 72.56 Remote location of contacts
Limited network coverage
Network coverage and syncing problems
Battery charging issues
2 1 9 9 06/06/2015 22:18 43.89 3.16 23.12 70.16
3 1 9 9 07/06/2015 06:27 9.25 3.58 49.07 61.89
4 1 11 11 09/06/2015 23:10 16.52 1.68 21.77 39.94
5 2 24 24 13/06/2015 15:20 27.13 46.17 26.69 99.74 Remote Chiefdom
Several cases occurring in close proximity and time to each other
Technical difficulties assigning contactsa
Far from place where phones could be charged
6 2 14 14 17/06/2015 15:13 2.61 13.14 108.75 124.47
7 2/3 36 34 18/06/2015 15:58 42.75 4.53 22.47 67.05
8 2 6 6 24/06/2015 17:10 3.55 11.36 3.83 18.73
9 4 24 15 29/06/2015 21:06 16.05 70.28 1.39 87.72 Technical difficulties assigning contactsa
Transport difficulties for CTs led to CTC monitoring with paper formb
10 4 120 98 16/06/2015 22:54 11.43 81.05 128.26 251.97
11 5 52 52 12/07/2015 14:26 19.57 2.88 5.35 27.81 Long contact lists
Contacts added after initial entry and assignment
Long CT travel distances
Management error in CT assignmentc
WHO intervention including CTCs and CTs having to monitor additional non-quarantined households d
Monitoring issues for CTs e
Syncing and network connectivity difficulties
Technical problemsf
Misplaced phones
Battery charging issues
12 5 23 23 14/07/2015 11:10 21.96 29.25 18.13 69.31
13 5 5 5 17/07/2015 15:01 30.95 23.43 11.7 66.08
14 6 112 51 25/06/2015 21:11 14.28 26.83 122.75 163.56 CTC user error in assignment requiring retraining and support
System errors with monitoring features. (Rectified for later cases)
15 6 92 14 02/07/2015 17:21 16.08 76.95 275 296.54
16 5 0 0 18/06/2015 21:26 59.51     No contacts registered
Secret burial 1 1 24 24    3.21 89.37   Syncing delays or network problems
Late reassignment of contacts
Secret burial 2 6 66 0    59.32    Inaccessible due to flooding
  1. Footnotes
  2. a This included difficulties in basic app functions including switching on mobile data to use the app, syncing difficulties to receive and send contacts
  3. b CTs experienced difficulties traveling to monitor contacts so the CTC monitored the contacts, but as the app on the CTC phone was for assignment and not monitoring, the CTC used the paper form for monitoring
  4. c CTCs often incorrectly assigned to a named Chiefdom level feature which showed on the page of named CTs to assign to. This was a technical feature of the app that could not be hidden which meant that the contact was not monitored by the correct CT
  5. d Extra responsibilities were placed on CTs in this Chiefdom to also conduct monitoring of non-quarantined homes due to a spike in cases in this Chiefdom. This was on the advice of WHO
  6. e This included transportation issues of CTs to monitor contacts, syncing issues, network connectivity difficulties and technical problems, misplaced phones, battery charging issues that were specific to this Chiefdom when there were cases
  7. f Technical problems related to the study phones included syncing issues to receive and send information to the CommCare server, software error messages, and corrupt SD card problems that caused the app to not work