Volume 16, Number 12—December 2010
Historical Review
Mortality Risk Factors for Pandemic Influenza on New Zealand Troop Ship, 1918
Jennifer A. Summers
, Nick Wilson, Michael G. Baker, and G. Dennis Shanks
, Nick Wilson, Michael G. Baker, and G. Dennis Shanks
Table 1
Mortality rates during pandemic influenza outbreak, by rurality score, aboard His Majesty’s New Zealand Transport Tahiti, 1918*
| Rurality score† | No. deaths | Mortality rate/ 1,000 persons | Crude mortality rate ratio (95% CI) |
|---|---|---|---|
| 0 (urban) | 32 | 81.0 | 1.0 (reference) |
| 1–2 | 18 | 60.6 | 0.75 (0.43–1.31) |
| 3–4 | 12 | 60.3 | 0.74 (0.39–1.41) |
| 5–6 | 7 | 59.8 | 0.73 (0.33–1.63) |
| 7–8 | 8 | 88.9 | 1.10 (0.52–2.30) |
*CI, confidence interval.
†Calculated by using occupation and address. Highest score was rural occupation plus rural address.
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