The Natural History of Chronic Airflow Obstruction Revisited: An Analysis of the Framingham Offspring Cohort

Am J Respir Crit Care Med. 2009 Jul 1;180(1):3-10. doi: 10.1164/rccm.200901-0047OC. Epub 2009 Apr 2.

Abstract

Rationale: Understanding normal lung development and aging in health and disease, both in men and in women, is essential to interpreting any therapeutic intervention.

Objectives: We aimed to describe lung function changes in healthy never-smoking males and females, from adolescence to old age, and to determine the effects of smoking and those derived from quitting.

Methods: Prospective cohort study within all participants of the Framingham Offspring cohort who had two or more valid spirometry measurements during follow-up (n = 4,391; age range at baseline 13 to 71 yr), with a median follow-up time of 23 years.

Measurements and main results: To best fit the curves describing FEV(1) changes with age to raw data, we used a generalized additive model with smooth terms and incorporating the subject-specific (longitudinal) random effects. We found that: (1) healthy never-smoker females achieve full lung growth earlier than males, and their rate of decline with age was slightly, but not significantly, lower; (2) smoking increases the rate of lung function decline, both in males and in females; (3) there is a range of susceptibility to the effects of smoking. The presence of respiratory symptoms at baseline and/or a respiratory diagnosis during follow-up appears to identify a group of susceptible smokers; and (4) quitting smoking has a beneficial effect at any age, but it is more pronounced in earlier quitters.

Conclusions: Lung function changes from adolescence to old age differ in males and females, smoking has similar deleterious effects in both sexes, and quitting earlier is better.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Aging / physiology*
  • Female
  • Forced Expiratory Volume
  • Health Surveys
  • Humans
  • Lung / growth & development
  • Lung / physiology*
  • Lung / physiopathology
  • Male
  • Middle Aged
  • Prospective Studies
  • Smoking / adverse effects
  • Smoking / physiopathology*
  • Smoking Cessation
  • Spirometry
  • Young Adult