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Volume 19, Number 6—June 2013

Research

Effect of Winter School Breaks on Influenza-like Illness, Argentina, 2005–2008

Roberto C. GarzaComments to Author , Ricardo Basurto-Dávila, Ismael R. Ortega-Sanchez, Luis Oreste Carlino, Martin I. Meltzer, Rachel Albalak, Karina Balbuena, Pablo Orellano, Marc-Alain Widdowson, and Francisco Averhoff
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (R.C. Garza, I.R. Ortega-Sanchez, M.I. Meltzer, R. Albalak, M.-A. Widdowson, F. Averhoff); Los Angeles County Department of Public Health, Los Angeles, California, USA (R. Basurto-Dávila); Ministerio de Salud de la Nación, Buenos Aires, Argentina (L.O. Carlino, K. Balbuena, P. Orellano)

Main Article

Table 2

Estimated IRRs of visits to a health care provider for ILI surrounding winter school breaks, by patient age, Argentina, 2005–2008*

Patient age, y Time in relation to winter school break, IRR (95% CI)
Pseudo R2
3 wk before 2 wk before 1 w before Wk 1 of break Wk 2 of break 1 wk after 2 wk after 3 wk after
0–4 1.09
(0.96–1.24) 1.09
(0.96–1.23) 1.10
(0.97–1.25) 1.01
(0.89–1.15) 0.95
(0.84–1.07) 0.89
(0.79–1.01) 0.93
(0.83–1.05) 1.03
(0.93–1.15) 0.70
5–14 1.09
(0.95–1.26) 1.10
(0.94–1.29) 1.03
(0.90–1.19) 0.83(0.72–0.95) 0.69(0.61–0.79) 0.67(0.59–0.76) 0.81(0.71–0.92) 0.96
(0.85–1.10) 0.70
15–24 1.15
(0.97–1.35) 1.10
(0.95–1.29) 1.04
(0.90–1.19) 0.91
(0.80–1.04) 0.88
(0.77– 1.01) 0.87(0.77–0.99) 0.86(0.76–0.97) 0.95
(0.85–1.08) 0.72
25–44 1.11
(0.94–1.32) 1.07
(0.92–1.26) 1.02
(0.87–1.19) 0.93
(0.80–1.08) 0.90
(0.77–1.05) 0.87
(0.75–1.00) 0.83(0.72–0.95) 0.93
(0.81–1.07) 0.72
45- 64 1.10
(0.94–1.30) 1.07
(0.91–1.26) 1.03
(0.87–1.21) 0.95
(0.82–1.11) 0.92
(0.78–1.08) 0.91
(0.78–1.06) 0.86(0.74–0.99) 0.91
(0.79–1.05) 0.72
>65 1.05
(0.85–1.31) 1.14
(0.93–1.41) 1.05
(0.87–1.27) 1.04
(0.84–1.28) 1.09
(0.90–1.31) 1.05
(0.87–1.27) 0.99
(0.84–1.17) 1.06
(0.88–1.27) 0.66

*IRRs were used to estimate whether incidence of ILI-associated visits in a particular week were lower, higher, or did not deviate from the expected seasonal ILI patterns. Each row represents a separate regression model. Boldface indicates statistically significant changes at the 0.05 confidence level. IRR, incidence rate ratio; ILI, influenza-like illness.

Main Article

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