https://www.selleckchem.com/products/AZD7762.html On the other hand, when data were imputed, the mean of the eigenvalues over the 10 missing imputation runs overlapped with the ones derived from the PCA applied to the original data set. These results were confirmed when real data sets from the National Health and Nutrition Examination Survey were analyzed. We accept the hypothesis that the EM algorithm for missing data imputation applied before PCA aimed to derive biochemical profiles and dietary patterns is an effective technique especially for relatively small sample sizes. STUDY OBJECTIVES The coexistence of sleep-related breathing disorders (SRBD) and sleep bruxism (SB) is often mentioned in the literature. Polysomnography (PSG) with video recording gives the best opportunity to identify both of these phenomena. This study aimed to evaluate the relationship between SRBD and SB. METHODS Patients from the Clinic of Prosthetic Dentistry operating at Wroclaw Medical University with diagnosed probable SB were subjected to one-night video-polysomnography. PSGs were evaluated according to standard sleep criteria. The results of the examination were analyzed for the occurrence of SB and SRBD. The Bruxism Episodes Index (BEI) and the types of electromyographical pathways (phasic, tonic, mixed) were used to evaluate SB. The Apnea/Hypopnea Index (AHI) and Oxygen Desaturation Index (ODI) were used to assess respiratory events. Subjects were divided into two groups according to SB occurrence the studied group (bruxers, BEI ≥ 2) and control group (non-bruxers, BEI less then 2). RESULTS Quantitative analysis showed a lack of a statistically significant relationship between BEI and AHI (p = 0.82) and ODI (p = 0.90) in the studied group and controls. Qualitative analysis showed that the increase in both AHI and ODI was statistically significantly correlated with the increase in the number of tonic types of electromyographical pathways (p = 0.047, p = 0.006, respectively). CONCLU