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Table 3 Polysomnographic variables

From: Prevalence and severity of syndrome Z in women with metabolic syndrome on waiting list for bariatric surgery: a cross-sectional study

Variables NO-OSA Mild OSA Moderate OSA Severe OSA P
(n = 20) (n = 23) (n = 17) (n = 23)
TST (min) 368.3 ± 72.7 348.1 ± 41.1 354.8 ± 36.6 355.5 ± 60.8  
SE (%) 90.7 ± 5.6 89.5 ± 10 87.2 ± 6.9 85.9 ± 8.6  
NREM1% 3.8 ± 1.9 9.6 ± 16 6.1 ± 2.1 7.1 ± 2.5  
NREM2% 56.5 ± 7.2 50.5 ± 11.9 52.6 ± 12 55.3 ± 5.6  
NREM3% 25.5 ± 7.8 25.8 ± 9.6 27.6 ± 8.8 25.7 ± 6.4  
REM% 14.1 ± 7.3 13.6 ± 5.3 11.3 ± 6 11.1 ± 6.9  
AHI/h 3.4 ± 0.9 9.9 ± 3.3 21.2 ± 5.5a, b 52 ± 14.5a, b, c ***
OAI/h 5.5 ± 4.6 6.6 ± 4.2 30.6 ± 30.4 88 ± 67.2a, b, c ***
CAI/h 0.5 ± 0.5 1.7 ± 1.3 1.6 ± 0.8 3.4 ± 3 ***
MAI/h 0 1 ± 0 1 ± 0 4.8 ± 4.1 ***
Hypop/h 2.4 ± 0.6 8.6 ± 3.3 16.1 ± 5.9 35.4 ± 14.9a, b, c ***
SpO2 vigília 95.9 ± 1.6 94.5 ± 1.3 95 ± 1.6a 93.2 ± 2.1a, b, c *
SpO2 sleep 94.6 ± 2.5 93.6 ± 1.9 93.7 ± 1.2 89.5 ± 4.3 ***
SpO2 <90% TST (%) 0.4 ± 0.2 23.5 ± 35 22.5 ± 38.4 39.3 ± 35.1 ***
SpO2 <80% TST (%) 0 8.5 ± 0.3 9.8 ± 3.1 11.3 ± 3.5 ***
SpO2 <70% TST (%) 0 2.8 ± 1.9 3.5 ± 1.7 4 ± 2.1 ***
RH wake 87 ± 7.4 85 ± 8.6 88 ± 10.5 87.5 ± 13.2  
HR med. sleep 81.6 ± 7.5 75.5 ± 14.1 73 ± 8.8 72.5 ± 9.1  
HR máx. sleep 137.6 ± 43.6 125.4 ± 22.6 104.6 ± 15.8a 103.2 ± 16.0a, b **
HR min. sleep 48.2 ± 8.5 53.1 ± 14.1 41.1 ± 12.5 46.8 ± 6.8  
ODI/h 4.5 ± 5 6.9 ± 4 17.3 ± 8.1 50.1 ± 24.2  
  1. Data are expressed as mean (± SD) or no (%)
  2. OSA obstructive sleep apnea, TST total sleep time, SE sleep efficiency, NREM1 sleep stage 1 without rapid eye movements, NREM2 sleep stage 2 without rapid eye movements, NREM3 stage 3 of sleep without rapid eye movements, REM sleep with rapid eye movement, AHI apnea/hypopnea index per hour of sleep, OAI obstructive apnea index per hour of sleep, CAI central apnea index per hour of sleep, MAI mixed apnea index per hour of sleep, Hipop/h hypopnea index per hour of sleep, SpO 2 peripheral oxyhemoglobin saturation, HR heart rate, ODI oxyhemoglobin desaturation index, Min minutes, SD standard deviation
  3. * P < 0.05; ** P < 0.01; *** P < 0.001
  4. aNo-OSA vs moderate OSA or severe OSA
  5. bMild OSA vs moderate OSA or severe OSA
  6. cModerate OSA vs severe OSA