... Data were analyzed by using SPSS software ver-sion 13.0 (SPSS, Chicago, IL, USA) and were ex-pressed as mean ± standard deviation. The seasonal distribution of the variables was analyzed with ... limitation of the study is small num-ber of the patients and absence of a control group without OSA and this was because of limited financial support. However this study may be accepted as a pilot ... of the vascular endothelium in ob-structive sleep apnea. Circulation, 2008;117:2270-2278. 23. Iber C, Ancoli-Israel S, Chesson AL, Quan SF. The AASM Manual for the Scoring of Sleep and Associated...