Figure 1.

Percent change in forced vital capacity (FVC) and forced expiratory volume in 1 second (FEV₁) (and 95% confidence intervals) for an increase of 5°C in ambient temperature or 5% in relative humidity (%), the Normative Aging Study, 1995–2011.

Temperature and relative humidity exposures were investigated simultaneously in 3 models depending on the time-windows of exposure: 4 hours, polynomial distributed lag from 0 to 6 days, moving averages, respectively. Results were adjusted for age, race, height, weight, education level, smoking status, cumulative smoking, season of the medical exam, day of the week, asthma, chronic bronchitis, emphysema, methacholine responsiveness, corticosteroids, sympathomimetic alpha and beta, anticholinergics.