Odds ratios (OR) and 95% confidence intervals (95% CI) for the occurrence risk of subsequent cortical arousal at apnea/hypopnea terminations.

Logistic multivariate regressions were performed between each autonomic cardiac index during apneas/hypopneas (expressed in tertiles) and CA occurrence, with adjustment for the potential effects on CA occurrence of minimum and average oxygen saturation, apnea/hypopnea type, sleep stage, interval inter-events, and subjects.