Volume 19, Number 6—June 2013
Research
Effect of Winter School Breaks on Influenza-like Illness, Argentina, 2005–2008
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.