Factors associated with risk of all-cause mortality (univariate Cox model).

Time*BMI: Body Mass Index; VC: Vital Capacity expressed as percentage of predicted value; FEV1: Forced Expiratory Volume in one second; AIH: Apnea Hypopnea index expressed as number of events per hour of sleep; Combination of cardiovascular agents: Combination of a diuretic and at least one other cardiovascular agent among ß-Blokers, Calcium antagonists, Converting Enzime Inhibitors, Antagiotensin II receptor blockers; COPD: Chronic Obstructive Pulmonary Disease. Continuous data were converted to dichotomous data (> or−2 is associated with lower risk of death than BMI bellow 39.4 kg.m−2.