Figure 3
From: Air pollution and lung function among susceptible adult subjects: a panel study
COPD panel: changes in FEV 1 per interquartile increase of selected metals from PM 2.5 samples during the previous 24, 48 or 72 hours* *Regression coefficients β (dots) and 95% confidence intervals (bars) from GEE models for panel data controlling for repeated individual observations, temperature, relative humidity, and day of the week, representing changes in FEV1 (% of predicted) per interquartile range increase of metal concentration (see Table 2 for the IQR values).