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Table 1 Comparisons of baseline parameters between patients who completed the 12-month carotid IMT study and those who did not

From: A prospective cohort study of the long-term effects of CPAP on carotid artery intima-media thickness in Obstructive sleep apnea syndrome

  Completed study (n = 50) Did not complete study (n = 50) P value
Male/Female 41/9 43/7 0.786
Age (yrs) 49.5 (1.4) 47.8 (1.7) 0.417
Body mass index (kg/m²) 28.1 (0.6) 28.2 (0.7) 0.954
Neck circumference (cm) 39.6 (0.5) 39.4 (0.5) 0.703
Systolic blood pressure (mmHg) 140.3 (3.1) 136.5 (3.1) 0.384
Diastolic blood pressure (mmHg) 80.6 (1.8) 79.8 (1.9) 0.749
Waist circumference (cm) 96.8 (1.6) 98.0 (1.7) 0.611
Hip circumference (cm) 101.6 (1.3) 102.6 (1.4) 0.602
Smoking status    
   Non smoker 33 36 0.666
   Smoker 17 14  
Alcoholic consumption    
   Non drinker 23 21 0.840
   Drinker 27 29  
ESS (0-24) 13.1 (0.7) 12.7 (0.6) 0.663
Congestive Heart Failure    
Yes 3 0 0.242
No 47 50  
Diabetes    
Yes 6 8 0.774
No 44 42  
Hypertension    
Yes 23 18 0.416
No 27 32  
Carotid plaque in baseline study    
Yes 12 10 0.810
No 38 40  
AHI (events per hr) 37.7 (3.0) 38.5 (3.4) 0.854
REM-AHI (events per hr) 35.9 (4.3) 33.1 (4.3) 0.652
Non-REM-AHI (events per hr) 37.8 (3.1) 38.6 (3.5) 0.878
Minimum SaO2 (%) 74.7 (2.2) 76.7 (2.2) 0.530
Mean SaO2 (%) 93.0 (0.6) 93.0 (0.6) 0.980
Arousal index (per hr of sleep) 29.3 (2.0) 28.8 (2.2) 0.857
Percentage of sleep time with SaO2<90% 13.7 (3.1) 7.5 (1.6) 0.081
Snoring/TST (%) 14.2 (3.9) 23.7 (4.0) 0.102
Sleep efficiency (%) 83.4 (1.5) 79.9 (1.8) 0.141
Mean Carotid IMT (micron) 758.6 (20) 742.6 (20) 0.573
  1. Data expressed as mean (SE). TST = total sleep time