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Table 2 Estimated excess risk (%) of the 2011 heat wave on mortality and ED visits in Harris County, Texas, by age groups and heat-wave definitions a

From: Impact of the 2011 heat wave on mortality and emergency department visits in Houston, Texas

Health outcomes Age group (years) August 2–30, 2011 ≥95th percentile ≥97th percentile ≥99th percentile
All-cause mortality All 0.6 (-5.5, 7.1)b 5.0 (-5.6, 16.9) 6.0 (-8.3, 22.5) 15.8 (-15.6, 59.1)
0 - 6 -35.6 (-61.6, 8.1) -32.6 (-71.6, 60.2) -56.6 (-87.0, 45.1) -91.7 (-99.6, 75.6)
6 -65 3.4 (-7.1, 15.1) 4.7 (-13.1, 26.1) 18.9 (-7.2, 52.2) 49.8 (-12.9, 157.7)
>65 0.1 (-7.0, 7.8) 5.8 (-6.8, 20.1) 1.8 (-14.4, 20.9) 6.3 (-27.1, 54.8)
All-cause ED visits All 3.6 (0.6, 6.6) 6.2 (0.9, 11.7) 7.1 (0.02, 14.7) 13.3 (-2.4, 31.5)
0 - 6 1.4 (-4.6, 7.7) 3.3 (-7.1, 14.8) -0.7 (-13.9, 14.6) 8.0 (-20.1, 46.1)
6 -65 2.8 (-0.1, 5.9) 5.1 (0.02, 10.5) 6.7 (-0.3, 14.1) 9.3 (-5.7, 26.7)
>65 8.9 (5.1, 12.8) 13.1 (6.4, 20.3) 16.9 (7.6, 27.0) 40.1 (17.0, 67.8)
  1. aThe 2011 heat wave was defined in four ways: August 2–30, 2011, a period with continuous heat advisories issued by the National Weather Service Houston/Galveston office; and periods of 2 or more consecutive days during August 2011 with daily mean temperature above the 95th, 97th, 99th percentiles of the daily mean temperature distribution in 2011; b95% confidence intervals.