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Table 2 Weekly Weather Patterns and Incidence of Invasive Pneumococcal Disease in Philadelphia.

From: Let the sun shine in: effects of ultraviolet radiation on invasive pneumococcal disease risk in Philadelphia, Pennsylvania

  Univariable Models Multivariable Modela, b
Environmental or Meteorological Exposure IRR (95% CI) P IRR (95% CI) P
Cooling Degree-Days (°C)b 0.92 (0.90 - 0.94) < 0.001 0.97 (0.94 to 1.00) 0.054
Maximum Temperature (°C) 0.97 (0.96 - 0.97) < 0.001 1.03 (1.003 to 1.06) 0.028
Minimum Temperature (°C) 0.96 (0.95 - 0.97) < 0.001 ... ... ...
Relative Humidity (%) 0.98 (0.97 - 0.99) 0.002 ... ... ...
UV Index 0.89 (0.87 - 0.92) < 0.001 0.70 (0.54 - 0.91) 0.007
Sulphur Oxides (ppm × 100) 1.73 (1.27 - 2.37) 0.002 ... ... ...
Average Wind Speed (km/h) 1.01 (1.006 - 1.015) < 0.001 ... ... ...
  1. NOTE: Incidence rate ratios (IRRs) reflect change in disease risk per unit change in the meteorological variable in question. CI, confidence interval; ppm, parts per million.
  2. aThe model was also adjusted for seasonal oscillation, cumulative cases during the prior month, calendar year and year-squared.
  3. bModel deviance statistic chi-squared = 3156 on 9317 d.f., P = 1.000.
  4. cCooling degree days are defined as the number of degrees a daily mean temperature is above 24°C. For example, a day with an average temperature of 27°C would have 3 cooling degree-days.