Table 2.
Results of Regression Analysis to Evaluate Associations With Number of Secondary Cases Generated, Ebola Epidemic, Guinea, 2014–2016
| Variable | Secondary Cases | IRR | 95% CI | P Value |
|---|---|---|---|---|
| Intercepta | 0.69 | 0.38, 1.28 | 0.239 | |
| Sex | ||||
| Female | 1.00 | Referent | ||
| Male | 0.71 | 0.55, 0.93 | 0.012 | |
| Outcome | ||||
| Alive, ETU+ | 0.31 | 0.19, 0.51 | <10−3 | |
| Dead, ETU+, safe burial | 0.62 | 0.38, 0.99 | 0.046 | |
| Dead, ETU−, safe burial | 1.00 | Referent | ||
| Dead, ETU−, unsafe burial | 1.82 | 1.10, 3.02 | 0.018 | |
| Location | ||||
| Urban | 1.00 | Referent | ||
| Rural | 1.18 | 0.90, 1.54 | 0.224 | |
| Age group, years | ||||
| 0–14 | 0.35 | 0.21, 0.57 | <10−3 | |
| 15–34 | 0.68 | 0.49, 0.93 | 0.015 | |
| 35–54 | 1.00 | Referent | ||
| 55–74 | 0.94 | 0.63, 1.40 | 0.757 | |
| 75–99 | 1.47 | 0.55, 3.91 | 0.438 | |
| Generation | ||||
| First | 1.76 | 1.27, 2.44 | 0.001 | |
| Subsequent | 1.00 | Referent |
Abbreviations: CI, confidence interval; ETU+, attended an Ebola treatment unit; ETU−, did not attend an Ebola treatment unit; IRR, incidence rate ratio.
a Defined as the mean number of secondary cases for women, aged 35–54 years, who did not survive, did not go to an ETU, and had a safe burial, in an urban area, and who were not the first generation of a chain.