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
68
185
200
453
15.0%
40.8%
44.2%