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Table 3 Model Results. Rate ratios (95% confidence intervals) from the models assessing interactions of the weather and pollution variables with period (outbreak vs non-outbreak) within the best single pollutant model.

From: An outbreak of cardiovascular syndromes requiring urgent medical treatment and its association with environmental factors: an ecological study

  Best single pollutant model variables Period by variable interaction terms
Model Minimum air temperature (lag 3 days) Maximum relative humidity (lag 3 days) Mean solar radiation (no lag) Minimum PM10 (lag 3 days) Period Interaction variable Rate ratio in outbreak Rate ratio in non-outbreak
Best single pollutant model 0.86 (0.77 – 0.96) 1.09 (1.05 – 1.14) 0.81 (0.59 – 1.11) 1.05 (1.01 – 1.09) NA NA NA NA
Period by mean solar radiation (no lag) 0.86 (0.77 – 0.96) 1.09 (1.04 – 1.14) 0.97 (0.86–1.1) 1.05 (1.01 – 1.09) 0.80 (0.51 – 1.23) 1.48 (1.04 – 2.1) 1.44 (1.00 – 2.07) 0.97 (0.86–1.10)
Period by max ozone (lag 1 day) 0.87 (0.78 – 1.97) 1.09 (1.04 – 1.14) 1.01 (0.89 – 1.14) 1.05 (1.01 – 1.09) 0.86 (0.58 – 1.27) 1.13 (1.01 – 1.27) 1.13 (1.01 – 1.26) 1.00 (0.97–1.03)
Period by Max ozone (lag 5 days) 0.85 (0.76 – 0.95) 1.09 (1.05 – 1.14) 0.98 (0.87 – 1.11) 1.05 (1.01 – 1.09) 0.87 (0.60 – 1.28) 1.12 (1.00 – 1.25) 1.11 (0.99 – 1.24) 0.99 (0.96–1.01)
Period by max air temp (no lag) 0.86 (0.77 – 0.96) 1.09 (1.04 – 1.13) 0.99 (0.88 – 1.11) 1.05 (1.01 – 1.09) 0.46 (0.21 – 1.01) 1.32 (1.07 – 1.64) 1.27 (1.03 – 1.57) 0.96 (0.91–1.01)
Period by min air temp (no lag) 0.86 (0.77 – 0.96) 1.09 (1.04 – 1.13) 0.98 (0.87 – 1.11) 1.05 (1.01 – 1.09) 0.64 (0.34 – 1.20) 1.41 (1.03 – 1.92) 1.35 (0.99 – 1.85) 0.96 (0.86–1.08)
Period by min air temp (lag 4 days) 0.83 (0.73 – 0.94) 1.09 (1.05 – 1.14) 0.98 (0.87 – 1.11) 1.05 (1.01 – 1.09) 0.42 (0.20 – 0.90) 1.71 (1.18 – 2.46) 1.77 (1.22 – 2.58) 1.04 (0.92–1.18)
Period by mean solar radiation (lag 5 days) 0.86 (0.77 – 0.96) 1.09 (1.04 – 1.13) 0.98 (0.87 – 1.11) 1.05 (1.01 – 1.08) 0.84 (0.55 – 1.27) 1.41 (1.01 – 1.96) 1.38 (0.99 – 1.92) 0.98 (0.93–1.04)
  1. NA = Not Applicable