Table 9. Hazard ratios for total dengue infections in the first year of follow-up of the cohort in Yucatan, Mexico.

Variable	Hazard ratio	(95%CI)
Age
≤ 8	Ref	Ref
9–14	1.06	0.59, 1.89
15–19	1.77	0.79, 3.96
20–49	1.27	0.72, 2.24
≥ 50	1.17	0.44,3.09
Gender
Males	Ref	Ref
Females	1.65	1.04, 2.62
City
Merida	Ref	Ref
Ticul	7.17	3.12, 16.49
Progreso	2.04	1.12, 3.76
Baseline status
Dengue non-naïve	Ref	Ref
Dengue naïve	15.35	7.19, 33.08