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Table 2 Predicted daily rates of ER visits and the relative risks associated with the volcanic activity

From: Emergency room visits for respiratory conditions in children increased after Guagua Pichincha volcanic eruptions in April 2000 in Quito, Ecuador Observational Study: Time Series Analysis

  Age groups Males Females
   estimate LCI UCI estimate LCI UCI
Daily ratesa        
  0–4 0.104 0.099 0.110 0.080 0.076 0.086
  5–9 0.027 0.024 0.030 0.020 0.018 0.023
  10–15 0.007 0.006 0.009 0.007 0.005 0.008
  all 0.043 0.041 0.045 0.040 0.039 0.042
Relative Risksb        
Fumarolic activity period – Period 1      
  0–4 2.008 1.610 2.504 1.953 1.509 2.527
  5–9 1.698 1.075 2.681 1.358 0.746 2.472
  10–15 1.180 0.438 3.180 1.681 0.690 4.098
  all 1.927 1.587 2.339 1.799 1.458 2.220
One week post eruption – Period 2      
  0–4 2.212 1.791 2.732 2.156 1.685 2.758
  5–9 1.331 0.797 2.222 1.106 0.571 2.140
  10–15 2.102 0.987 4.476 0.996 0.318 3.121
  all 1.965 1.621 2.381 1.799 1.458 2.220
Two weeks post eruption – Period 3      
  0–4 1.995 1.699 2.344 2.280 1.913 2.718
  5–9 1.434 1.004 2.048 1.108 0.691 1.777
  10–15 1.820 1.013 3.270 0.488 0.156 1.530
  all 1.795 1.552 2.076 1.894 1.632 2.199
Three weeks post eruption – Period 4      
  0–4 2.056 1.799 2.350 2.096 1.798 2.442
  5–9 1.579 1.188 2.100 1.067 0.717 1.586
  10–15 1.625 0.972 2.716 0.879 0.431 1.790
  all 1.891 1.678 2.130 1.807 1.591 2.052
  1. aestimated baseline together with 95% confidence interval (LCI, UCI) for cases per day per 1000 served population before and after volcanic eruption.
  2. b relative risks together with 95% confidence interval (LCI, UCI) for cases per day per 1000 served population for effects of the day of the week, official holidays and weekly precipitation.