Relationship between the single-breath N 2 test and age, sex, and smoking habit in three North American cities

A. S. Buist, H. Ghezzo, N. R. Anthonisen, R. M. Cherniack, S. Ducic, P. T. Macklem, J. Manfreda, R. R. Martin, D. McCarthy, B. B. Ross

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

This report describes a collaborative study conducted in Montreal, Canada, Portland, Ore., and Winnipeg, Canada, to establish the relationships between the single-breath N 2 test and age, sex, and smoking and to determine the prevalence of functional abnormalities in these populations. In nonsmokers, age-related regressions for closing volume, closing capacity, and the slope of phase III obtained from the single-breath N 2 test, plus the ratio of the 1-s forced expiratory volume to the forced vital capacity had very similar slopes, suggesting that differences in geographic location, climate, air pollution, and occupation had no effect on lung function detectable by these tests. Among the 6 city/sex groups there was no systematic difference in the prevalance of functional abnormalities between the cities, but closing capacity expressed as a percentage of total lung capacity was abnormal most often in men and the slope of the alveolar plateau was abnormal most often in women. The prevalence of respiratory symptoms within different smoking categories was similar in the 3 cities. Although the number of cigarettes smoked had a significant effect on every test except the ratio of the 1-s forced expiratory volume to forced vital capacity in men, the effect of age was considerably greater than the effect of smoking, and the dose-response relationship was weak. The authors conclude that additional factors may interact with smoking to place a smoker at risk of developing chronic airflow limitation.

Original languageEnglish (US)
Pages (from-to)305-318
Number of pages14
JournalAmerican Review of Respiratory Disease
Volume120
Issue number2
StatePublished - Dec 1 1979

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine

Fingerprint Dive into the research topics of 'Relationship between the single-breath N <sub>2</sub> test and age, sex, and smoking habit in three North American cities'. Together they form a unique fingerprint.

Cite this