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Volume 18, Number 1—January 2012

Research

The 1918–19 Influenza Pandemic in Boyacá, Colombia

Gerardo ChowellComments to Author , Cécile Viboud, Lone Simonsen, Mark A. Miller, Rodolfo Acuna-Soto, Juan M. Ospina Díaz, and Abel Fernando Martínez-Martín
Author affiliations: Arizona State University, Tempe, Arizona, USA (G. Chowell); National Institutes of Health, Bethesda, Maryland, USA (G. Chowell, C. Viboud, M.A. Miller); George Washington University, Washington, DC, USA (L. Simonsen); Universidad Nacional Autónoma de México, Delegación Coyoacán, Mexico (R. Acuna-Soto); Universidad Pedagógica y Tecnológica de Colombia, Boyacá, Colombia (J.M. Ospina Díaz, A.F. Martínez-Martín)

Main Article

Table 1

Age-specific excess-death rates associated with the October 1918 –January 1919 influenza pandemic wave in Boyacá, Colombia*

Age group, y Deaths from respiratory illness
Deaths from all causes
Excess mortality rate/10,000 population (95% CI) Relative risk/ background mortality rate† Excess mortality rate/10,000 population (95% CI) Relative risk/ background mortality rate†
All ages 40.1 (39.1–41.1) 5.2 42.1 (39.1–44.1) 1.7
0–4 118.1 (111.1–125.1) 3.0 118.1 (109.1–127.1) 1.3
5–9 21.1 (20.1–23.1) 13.5 26.1 (23.1–29.1) 3.6
10–14 19.1 (18.1–20.1) 11.4 18.1 (16.1–20.1) 3.2
15–19 28.1 (27.1–30.1) 13.4 27.1 (24.1–30.1) 3.3
20–24 32.1 (30.1–33.1) 12.6 35.1 (31.1–38.1) 3.5
25–29 36.1 (34.1–37.1) 51.3 42.1 (39.1–45.1) 5.7
30–39 37.1 (35.1–38.1) 6.9 39.1 (36.1–42.1) 2.2
40–49 36.1 (33.1–39.1) 11.8 36.1 (31.1–41.1) 1.6
50–59 35.1 (31.1–40.1) 11.5 27.1 (19.1–35.1) 1.3
60–69 73.1 (67.1–80.1) 4.1 69.1 (55.1–82.1) 1.1
70–79 83.1 (69.1–98.1) 3.4 82.1 (59.1–106.1) 0.9
>80 100.1 (81.1–120.1) 3.5 124.0 (87.2–160.8) 0.9

*Excess death estimates are based on observed mortality rates during pandemic weeks occurring in excess of background mortality rates derived from a seasonal regression model.
†Ratio of excess deaths divided by background deaths during influenza pandemic weeks, facilitating comparisons across age groups with different background risks for death.

Main Article

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