Sample size {14}
periodontitis, gingivitis
PERIODONTITIS, PERIODONTAL DISEASES, GINGIVITIS
The calculation of the power of this study is complicated by the fact that only limited information on changes in lung function is available. The only published trial on oral sanitation and its impact on lung function included 2 × 30 subjects with severe periodontal diseases and an average age of 65.7 years. The authors reported an improvement in FEVObservational studies could also be used for power calculation. The few studies on oral health and lung function consistently found lower lung function in subjects with periodontitis or gingivitis. A cross-sectional study in 1463 German adults aged 25 to 86 years showed FEVThe power analysis focuses on the second part of the study, in which two different treatments are realized, whereby in both arms assessments before and after treatment are performed (Fig. 