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Volume 16, Number 12—December 2010

Historical Review

Mortality Risk Factors for Pandemic Influenza on New Zealand Troop Ship, 1918

Jennifer A. SummersComments to Author , Nick Wilson, Michael G. Baker, and G. Dennis Shanks
Author affiliations: Author affiliations: University of Otago, Wellington, New Zealand (J.A. Summers, N. Wilson, M.G. Baker); Australian Army Malaria Institute, Enoggera, Queensland, Australia (G.D. Shanks)

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Table 2

Multivariate analyses of risk for death during pandemic influenza outbreak onboard His Majesty’s New Zealand Transport Tahiti, 1918*

aOR (95% CI) p value aOR (95% CI) p value
Demographic and sociodemographic
Age, continuous 1.03 (1.00–1.06) 0.071 1.04 (1.00–1.07) 0.025
Military rank, officer plus NCO vs. all other ranks§ 0.51 (0.24–1.12) 0.093 0.49 (0.23–1.08) 0.077
Occupational class based on prewar occupation,
groups 7–9 vs. groups 1–6¶ 0.72 (0.44–1.18) 0.196 0.83 (0.50–1.38) 0.468
Rurality score, continuous
0.97 (0.87–1.08)

1.00 (0.90–1.12)
Military unit, 40th Reinforcements New Zealand
Field Artillery vs all other units combined 3.04 (1.59–5.82) 0.001

*CI, confidence interval; aOR, adjusted odds ratio for death during the outbreak; NCO, noncommissioned officer.
†Hosmer-Lemeshow χ2 8.47, degrees of freedom 8, p = 0.389.
‡Hosmer-Lemeshow χ2 13.06, degrees of freedom 8, p = 0.110.
§Healthcare workers were included in other ranks.
¶Groups 1–6 indicate higher status occupations.

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