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Fig. 3 | Respiratory Research

Fig. 3

From: Evidence for harm reduction in COPD smokers who switch to electronic cigarettes

Fig. 3

Changes in FEV1 (a), FVC (b), and %FEV1/FVC (c) from baseline, at follow-up visit 1 (12 ± 1.5 months) and visit 2 (24 ± 2.5 months) separately for electronic cigarettes users (closed circles) and controls (closed triangles). All data expressed as mean and error bars are standard deviation of the mean. The p value is an overall comparison of both groups over the 24-month period

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