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Table 3 Use of asthma medication.

From: Adult asthma and traffic exposure at residential address, workplace address, and self-reported daily time outdoor in traffic: A two-stage case-control study

    Asthma medication
    No Yes, when needed Yes, regularly Total
Asthmatic symptoms NO Count 2253 81 45 2379
   % 94.7% 3.4% 1.9% 100.0%
  YES Count 68 185 200 453
   % 15.0% 40.8% 44.2% 100.0%
  1. Of those who reported asthmatic symptoms last 12 months did 85% also report using asthma medication regularly or when needed.