Cardiorespiratory PSG was performed in a sleep laboratory with camera monitoring using a PSG system (Alice 5; Philips Respironics) and assessment of nasal flow, thoracic and abdominal efforts, body position, oxygen saturation, heart rate, and snoring sounds. Sleep stages were analyzed visually ( 19). Central, mixed, and obstructive apneas, hypopneas, periodic breathing, hypoventilation periods, respiratory-related arousals, and heart rate variability were documented. The apnea-hypopnea index (AHI) was calculated (mean number of apneas and hypopneas per hour, total sleep time [TST]) and categorized in no OSA-hypopnea syndrome (OSAHS) (AHI ? 5 per hour), mild OSAHS (AHI > 5 per hour, ? 15 per hour), moderate OSAHS (AHI > 15 per hour, ? 30 per hour), and severe OSAHS (AHI > 30 per hour) ( 22). Sleep efficiency was categorized into excellent (90%–100%), adequate (80%–89%), poor (70%–79%), and insufficient (<70%)>
Hormones measurements
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