Figure 1. Dental plaque, gingival bleeding, pocket depth and remaining teeth in 28 smokers with COPD, 29 smokers who did not fulfill the criteria for COPD, matched for smoking, and 23 healthy non-smokers.

Mean values and 95% confidence intervals. There is an overall difference between the groups for all outcomes (dental plaque p<0.01, gingival bleeding p<0.001, pocket depth p<0.0001, remaining teeth p<0.001). **and ***indicate p<0.01 and p<0.001, respectively compared with non-smokers. ^# indicates p<0.05 compared with smokers without COPD.