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. 2008 Nov 14;179(3):235–240. doi: 10.1164/rccm.200809-1392OC

TABLE 1.

CHARACTERISTIC OF THE STUDY SAMPLE BY SLEEP-DISORDERED BREATHING SEVERITY

AHI < 5.0 events/h (n = 39) AHI 5.0–14.9 events/h (n = 34) AHI 15.0–29.9 events/h (n = 22) AHI ≥ 30.0 events/h (n = 23)
Demographics
 Male sex, % 43.6* 61.8 63.6 82.6
 White race, % 92.3 79.4 95.5 78.3
 Age, yr 37.7 (1.9) 46.5 (2.0) 51.6 (2.0) 52.4 (2.0)§
Body composition
 BMI, kg/m2 26.5 (0.8) 29.6 (1.1) 30.7 (0.8) 32.8 (1.3)§
 Waist circumference, cm 84.1 (1.8) 91.8 (2.3) 96.1 (2.3) 106.4 (3.2)§
 Percent body fat, % 30.3 (1.7) 31.9 (1.8) 32.6 (1.6) 34.9 (1.6)
Actigraphy monitoring
 Usual time in bed, h 7.8 (0.2) 7.6 (0.2) 7.8 (0.1) 7.5 (0.2)
 Sleep duration, h 7.2 (0.2) 7.0 (0.2) 7.3 (0.1) 6.5 (0.2)
Polysomnography
 Total sleep time, h 6.8 (0.2) 6.9 (0.2) 6.7 (0.2) 6.4 (0.2)
 Stage 1 sleep, % 8.1 (0.8) 10.4 (0.9) 11.1 (1.5) 15.8 (2.0)§
 Stage 2 sleep, % 55.7 (1.3) 60.0 (1.4) 62.7 (1.6) 62.4 (2.5)§
 Slow wave sleep, % 13.7 (1.2) 9.8 (1.0) 7.6 (1.1) 5.0 (1.4)§
 REM sleep, % 22.5 (0.8) 19.8 (1.1) 18.6 (1.6) 16.7 (1.2)§
 Arousal index, n/h 8.1 (0.4) 13.3 (1.0) 19.7 (1.3) 38.3 (4.3)§
 ΔSaO2, % 3.0 (0.2) 3.8 (0.2) 3.8 (0.2) 7.1 (0.9)§
Fasting serum measurements
 Glucose, mg/dl 94.7 (1.2) 97.9 (1.4) 100.9 (1.9) 102.5 (2.2)§
 Insulin, μU/ml 9.0 (0.7) 12.9 (1.0) 11.9 (1.2) 16.4 (1.7)§

Definition of abbreviations: AHI = apnea-hypopnea index; BMI = body mass index; REM = rapid eye movement; ΔSaO2 = average oxyhemoglobin desaturation.

*

Values reported are either percentages or means (SE).

P < 0.05 for comparisons across AHI groups (P values determined by χ2 for categorical variables or Cuzick's nonparametric test for trend for continuous variables).

P < 0.02 for comparisons across AHI groups (P values determined by χ2 for categorical variables or Cuzick's nonparametric test for trend for continuous variables).

§

P < 0.001 for comparisons across AHI groups (P values determined by χ2 for categorical variables or Cuzick's nonparametric test for trend for continuous variables).

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