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Fig. 3 | BMC Pulmonary Medicine

Fig. 3

From: Association between annual change in FEV1 and comorbidities or impulse oscillometry in chronic obstructive pulmonary disease

Fig. 3

Comparison of FEV1 and %FEV1 over time between current and former smokers with COPD. There were significant differences in FEV1 (A) or %FEV1 (B) between current and former smokers both 4 and 5 years after baseline. The bars represent mean ± standard error of the mean. The differences between current and former smokers were analyzed using unpaired t-tests. NS: not significant, *: p < 0.05, ** p < 0.01

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