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Table 2 Polysomnographic and Demographic features

From: Distinct polysomnographic and ECG-spectrographic phenotypes embedded within obstructive sleep apnea

Demographics and Polysomnogram Metrics Summary statistic (972) Mean ± SD Summary statistic (671) Mean ± SD
Age 50.8 ± 12.9 50.2 ± 12.7 years
Gender 65.3% male 63.9% male
Race 70.2% white 71.7% white
Body Mass Index Kg/M2 31.8 ± 7.4 31 ± 7.1
Total sleep time (TST) 379.4 ± 66.6 385.1 ± 60.3
Sleep efficiency (% TST) 79 ± 12.6 80.1 ± 11.6%
Wake After Sleep Onset (minutes) 83.4 ± 51.8 78.3 ± 48.3
S1 (% TST) 18.3 ± 14.6 17.3 ± 13.1
S2 (% TST) 60.3 ± 13.4 60.9 ± 12.3
S3 (% TST) 2.7 ± 4.9 2.7 ± 4.9
S4 (% TST) 0.7 ± 2.4 0.7 ± 2.4
REM (% TST) 17.9 ± 7.1 18.2 ± 6.8
Arousal Index/hour of sleep 29 ± 21.7 27.6 ± 20.8
RDI/hour of sleep 38.8 ± 27.1 36.4 ± 26.1
Obstructive apnea index/hour of sleep 16.9 ± 21.9 15.2 ± 20.2
Central apnea index/hour of sleep 1.1 ± 4.6 1.1 ± 4.9 (Median 0.1, 25th/75th percentile 0. 0.1)
Mixed apnea index/hour of sleep 1.5 ± 5.6 1.3 ± 4.8
Hypopnea index/hour of sleep 19.3 ± 13.2 18.9 ± 13
RDI-NREM/hour of sleep 37.4 ± 28.9 34.9 ± 27.9
RDI-REM/hour of sleep 43.2 ± 26.6 42.1 ± 26.5
Oxygen desaturation index/hour of sleep 25.5 ± 25.6 22.7 ± 24
Minimum saturation % 81 ± 9.1 81.7 ± 8.4
Time less than 85% saturation (minutes) 2.9 ± 8.2 2.4 ± 7.5
PLM/hour of sleep 6.4 ± 15.4 6 ± 15
  1. RDI respiratory disturbance index; REM rapid eye movement; NREM non-rapid eye movement; PLM periodic limb movement