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Table 3 Incidence density of respiratory symptom episodes and medication use among children 2003–2005

From: Traffic-related air pollution and respiratory symptoms among asthmatic children, resident in Mexico City: the EVA cohort study

  Asthmatic children Healthy children Incidence Ratio
Symptom events days ID* events days ID* IRR 95% CI
Coughing 3692 22705 16.3 400 7561 5.3 3.1 (2.8, 3.4)
Wheezing 1329 22698 5.9 52 7552 0.7 8.5 (6.4, 11.4)
Use of corticosteroids 2902 22699 12.8      
Use of bronchodilators 2638 22643 11.7      
  1. Definition: Incidence density (ID); Incidence density ratio (IRR); Confidence Interval (CI).
  2. * ID (per 100 children).