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Table 2. Gradation of Individual Responses to
Short-Term Ozone Exposure in People with Lung Disease
Table 2a
Functional Response
None
Small
Moderate
Large
FEV1 change Decrements of <3% Decrements of 3% to ≤10% Decrements of >10% but <20% Decrements of ≥20%
Nonspecific bronchial responsiveness

Within normal range Increases of <100% Increases of ≤300% Increases of >300%
Airway resistance (SRaw)

Within normal range ( 20%) SRaw increased <100% SRaw increased up to 200% or up to 15cm H2O/s SRaw increased >200% or more than 15 cm H2O/s
Duration of response None <4 hr >4 but ≤24 hr >24 hr


Table 2b
Symptomatic Response
Normal
Mild
Moderate
Severe
Wheeze

None With otherwise normal breathing With shortness of breath Persistent with shortness of breath
Cough Infrequent cough

Cough with deep breath Frequent spontaneous cough Persistent uncontrollable cough
Chest pain None Discomfort just noticeable on exercise or deep breath Marked discomfort on exercise or deep breath Severe discomfort on exercise or deep breath
Duration of response None <4 hr >4 but ≤24 hr >24 hr


Table 2c
Impact of Various Functional and/or Symptomatic Responses
Normal Functional and/or Symptomatic Responses
Small Functional and/or Mild Symptomatic Responses
Moderate Functional and/or Symptomatic Responses
Large Functional and/or Severe Symptomatic Responses
Interference with normal activity None Few individuals likely to limit activity Many individuals likely to limit activity Most individuals likely to limit activity
Medical treatment/ Self Medication No change Normal medication as needed Increased frequency or additional medication use Increased likelihood of physician or ER visit