Volume 12, Number 7—July 2006
Dispatch
Smallpox during Pregnancy and Maternal Outcomes
Hiroshi Nishiura*†
Table A4
Comparison of the frequency of deaths stratified by vaccination history, according to data from 19th- and early 20th-century outbreaks
| Reference | Unvaccinated |
Vaccinated |
||||
|---|---|---|---|---|---|---|
| Cases | Deaths | Cases | Deaths | p value* | OR (95% CI)† | |
| Welch (10), 1878 | 7 | 7 | 39 | 7 | <0.01 | NC |
| van der Willigen (3), 1893–1894 | 2 | 2 | 78 | 10 | 0.02 | NC |
| Rao (6), 1959–1962 | 12 | 9 | 82 | 17 | <0.01 | 11.5 (2.8–47.1) |
*2-sided.
†OR, odds ratio; CI, confidence interval; NC, not calculable.
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