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Table 5 Percent of patients reporting worsening symptoms on pollution or clean air visits

From: Respiratory effects of particulate air pollution episodes in former smokers with and without chronic obstructive pulmonary disease: a panel study

  Control COPD
Pollution days Clean air days Pollution days Clean air days
Symptoms % (n) % (n) % (n) % (n)
Nasal congestion discharge 50.0 (6) 45.4 (5) 68.8 (11) 30.8 (4)
Activity limitation 25.0 (3) 0.0 (0) 62.5 (10) 30.8 (4)
Chest tightness 33.3 (4) 9.1 (1) 43.8 (7) 7.7 (1)
Cough 66.7 (8) 36.4 (4) 56.2 (9) 15.4 (2)
Shortness of breath 41.7 (5) 9.1 (1) 62.5 (10) 23.1 (3)
Sputum thickness 41.7 (5) 9.1 (1) 50.0 (8) 15.4 (2)
Sputum amount 41.7 (5) 18.2 (2) 56.2 (9) 30.8 (4)
Wheeze 0.0 (0) 9.1 (1) 37.5 (6) 15.4 (2)
  1. Displayed are the number and percent of patients reporting worsening symptoms on at least one polluted air day and on at least one clean air day for the Control and COPD groups