Table 5. Incidence rates (IR) per 1,000 person-years of arbovirus confirmed symptomatic infections in the cohort in Yucatan, Mexico by age, gender, and city.

	Person-years at risk (N)	Dengue	IR (95%CI)	Chikungunya	IR (95%CI)	Zika	IR (95%CI)
All participants	3430.9 (3400)	12	3.5 (1.9, 5.9)	30	8.6 (5.8, 12.3)	8	2.3 (0.9, 4.5)
Age groups (years)
≤ 8	1001.4 (991)	3	2.9 (0.6, 8.8)	10	9.9 (4.8, 18.4)	4	3.99 (1.1, 10.2)
9–14	502.5 (484)	1	1.9 (0.03, 11.1)	4	7.9 (2.1, 20.4)	2	3.9 (0.5, 14.4)
15–19	145.3 (146)	1	6.88 (0.1, 38.3)	1	6.9 (0.1, 38.3)	0	0)
20–49	1490.1 (1456)	7	4.7 (1.9, 9.7)	11	7.4 (3.7, 13.2)	2	1.3 (0.2, 4.9)
≥ 50	291.5 (323)	0	0	4	13.7 (3.7, 35.1)	0	0
Gender
Male	1511.7 (1531)	0	0	9	5.9 (5.8, 12.3)	3	1.9 (0.4, 5.8)
Female	1919.2 (1869)	12	6.3 (3.2,10.9)	21	10.9 (6.8, 16.7)	5	2.6 (0.8, 6.1)
City
Merida	2164.3 (2021)	9	4.2 (1.9, 7.9)	18	8.3 (4.9, 13.1)	2	0.9 (0.1, 3.3)
Progreso	601.8 (641)	2	3.3 (0.4, 12.0)	5	8.3 (2.7,19.3)	1	1.7 (0.02, 2.3)
Ticul	682.9 (738)	1	1.5 (0.02, 8.2)	7	10.3 (4.1, 21.1)	5	7.3 (2.4, 17.1)