Table 1.

Demographics of normal subjects and patients with sleep apnea-hypopnea syndrome

VariablesNormal ControlModerate-to-Severe SAHSSevere SAHS
No. of subjects121212
Age, yr43 (6)44 (4)44 (6)
Systolic blood pressure, mmHg11.7 ( 1.1)11.7 (1.4)12.1 (0.7)
Diastolic blood pressure, mmHg7.4 (0.8)7.5 (1.4)7.7 (0.7)
BMI, kg/m225.7 (1.6)26.5 (1.7)32.1 (4.2)
AHI, events/h2.8 (3.3)29.6 (10.8)55.6 (19.0)
AI, events/h1.3 (2.1)14.8 (10.6)30.9 (20.0)
Mean SaO2, %93.6 (1.6)91.6 (1.4)88.9 (4.1)
Total no. of obstructive apnea3.3 (6.0)80.7 (56.4)106.3 (66.4)
Total no. of central apnea5.5 (8.6)6.3 (7.2)32.3 (28.2)
Total no. of mixed apnea0.2 (0.6)3.3 (6.0)*57.0 (108.9)
Total no. of hypopnea11.7 (11.2)82.3 (32.6)160.8 (53.6)
  • Values are means (SD). SAHS, sleep apnea-hypopnea syndrome; BMI, body mass index; AHI, apnea-hypopnea index; AI, apnea index; SaO2, arterial O2 saturation. Comparisons were performed with normal control subjects.

  • * P < 0.05;

  • P < 0.01;

  • P < 0.001.