Table 2 Percent change in total and cause-specific mortality associated to temperature. Results from the meta-analysis of 42 US cities during the period 1989–2000
Extreme temperature*Piecewise linear temperature†
Lag 0, % (95% CI)Lag 1, % (95% CI)2-day cumulative, % (95% CI)Lag 0, % (95% CI)Lag 1, % (95% CI)2-day cumulative, % (95% CI)
Cold exposure
Total mortality0.03 (−1.09 to 1.16)1.79 (0.87 to 2.72)1.59 (0.56 to 2.63)−0.19 (−0.22 to −0.15)0.23 (0.18 to 0.27)0.04 (0.01 to 0.08)
Myocardial infarction2.43 (−0.79 to 5.75)1.51 (−1.56 to 4.67)3.90 (0.18 to 7.76)0.00 (−0.11 to 0.11)0.25 (0.14 to 0.36)0.26 (0.15 to 0.36)
Cardiac arrest7.29 (−1.92 to 17.4)11.9 (2.32 to 22.4)16.2 (5.12 to 28.4)−0.25 (−0.61 to 0.12)0.62 (0.25 to 1.00)0.39 (0.07 to 0.71)
Heat exposure
Total mortality3.85 (2.54 to 5.18)2.04 (0.54 to 3.56)5.74 (3.38 to 8.15)0.70 (0.55 to 0.84)−0.13 (−0.29 to 0.02)0.52 (0.31 to 0.72)
Total mortality (ozone adjusted)3.17 (1.92 to 4.43)1.89 (0.43 to 3.38)4.91 (2.72 to 7.13)0.52 (0.41 to 0.63)−0.09 (−0.24 to 0.07)0.43 (0.24 to 0.61)
Myocardial infarction1.24 (−1.57 to 4.13)4.68 (1.56 to 7.89)4.37 (0.15 to 8.78)0.25 (−0.12 to 0.63)−0.05 (−0.38 to 0.28)0.17 (−0.29 to 0.63)
Cardiac arrest3.70 (−4.84 to 13.0)5.96 (−2.72 to 15.4)6.75 (−3.68 to 18.3)0.10 (−0.92 to 1.14)0.60 (−0.43 to 1.64)0.67 (−0.23 to 1.58)
  • *Per cent change in mortality on extreme temperature days relative to all other days.

  • †For cold exposure, this refers to per cent change in mortality per each degree of maximum daily temperature below 17°C; for heat exposure, this refers to per cent change in mortality per each degree of minimum daily temperature above 17°C.