Chronic nonspecific respiratory disease, Berlin, New Hampshire, 1961-1967: a cross-sectional study.

Abstract

A repeat study of a sample of the population of Berlin, New Hampshire in 1967 showed slightly lower disease prevalences than in 1961 after standardization for age, sex, and smoking habits. Results of some of the pulmonary function tests were slightly better in 1967. Levels of air pollution were less in 1967. It is believed that the decrease in air pollution could account for the decreased prevalence of disease and the slight improvement in pulmonary function.