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Volume 22, Number 8—August 2016
Research

Exposure-Specific and Age-Specific Attack Rates for Ebola Virus Disease in Ebola-Affected Households, Sierra Leone

Hilary Bower, Sembia Johnson, Mohamed S. Bangura, Alie Joshua Kamara, Osman Kamara, Saidu H. Mansaray, Daniel Sesay, Cecilia Turay, Francesco Checchi, and Judith R. GlynnComments to Author 
Author affiliations: London School of Hygiene & Tropical Medicine, London, UK (H. Bower, J.R. Glynn); Save the Children, Freetown, Sierra Leone (S. Johnson, M.S. Bangura, A.J. Kamara, O. Kamara, S.H. Mansaray, D. Sesay, C. Turay); Save the Children, London (F. Checchi)

Main Article

Table 3

Risk factors associated with being the first EVD case in a household, compared with all other household members in households of Ebola Treatment Centre survivors, Kerry Town, Sierra Leone, 2014–2015*

Risk factor Total population No. primary cases Risk,% Adjusted RR* (95% CI) p value†
Sex
M 400 47 11.8 1.3 (0.93–1.9)
F
537
50
9.3
1
0.1
Age, y‡
<2 54 3 5.6 0.57 (0.17–1.9)
2–4 86 2 2.3 0.24 (0.06–1.0)
5–9 131 2 1.5 0.15 (0.04–0.65)
10–14 121 3 2.5 0.26 (0.08–0.86)
15–19 107 7 6.5 0.69 (0.30–1.6)
20–29 179 17 9.5 1
30–39 114 26 22.8 2.4 (1.4–4.2)
40–49 63 15 23.8 2.5 (1.3–4.7)
>50
78
20
25.6
2.6 (1.5–4.7)
<0.001
Occupation§
Heathcare worker, formal and informal 21 10 47.6 3.9 (2.0–7.5)
Ebola front-line worker 11 3 27.3 2.5 (0.86–7.1)
Driver 23 6 26.1 1.7 (0.67–4.1)
Religious leader/chief/teacher 12 5 41.7 2.7 (1.1–6.9)
Farmer/fisherman/unskilled 54 12 22.2 1.7 (0.83–3.3)
Office/business 47 8 17.0 1.3 (0.62–2.8)
Child/student 511 15 2.9 0.41 (0.12–1.4)
Trader/tailor/service
205
25
12.2
1
0.01
Position in household
Household head 87 32 36.8 2.3 (1.5–3.8)
Household member 850 65 7.6 1 <0.001

*EVD, Ebola virus disease; RR, risk ratio. Adjusted for age, sex, and household clustering.
†p values calculated from likelihood ratio test in logistic regression model.
‡Age missing for 4 persons.
§No occupation recorded for 29 persons, including 28 with no individual-level data.

Main Article

Page created: July 15, 2016
Page updated: July 15, 2016
Page reviewed: July 15, 2016
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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