Table 5.

Multivariate analysis of characteristics and their RR of influenza-like illness in military subgroup

Characteristic (N = 1,468)	Multivariate RR (95% Cl)	P-value
Doxycycline	0.42 (0.19–0.91)	0.03
Female	2.43 (1.39–4.25)	< 0.01
Median duration of travel (days)	1.0 (0.99–1.01)	0.10
Asia	1.2 (0.57–2.5)	0.65
Africa	1.2 (0.54–2.71)	0.63
Cruise	4.6 (2.28–9.26)	< 0.01

RR = relative risk.