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Table 2 Annual Decline in Pulmonary Function calculated from the mean of all 5-year paired observations, and by linear regression over 15 years in the 200 subjects with all four observations

From: The Darlington and Northallerton Long Term Asthma Study: pulmonary function

  Annual Decline n Actual FEV1 l. Best FEV1 l. Best FVC l.
Males Over 5 Years All Subjects 776 41.0 (34.7–47.3) 42.9 (37.5–48.3) 63.1 (55.7–71.2)
   Never smokers 256 34.2 (22.2–46.2) 33.4 (22.7–44.1) 49.2 (35.6–62.8)
  Over 15 Years 85 46.7 (38.7–54.7) - 64.7 (54.6–74.8)
Females Over 5 Years All Subjects 848 28.9 (23.2–34.6) 34.4 (29.8–39.0) 45.8 (40.0–51.6)
   Never smokers 375 28.7 (22.4–38.8) 30.6 (22.2–35.2) 45.2 (36.4–54.0)
  Over 15 Years 115 24.7 (14.8–31.2) - 44.6 (37.9–51.3)