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Table 1 Selected perioperative characteristics

From: Risk of postoperative hypoxemia in ambulatory orthopedic surgery patients with diagnosis of obstructive sleep apnea: a retrospective observational study

Characteristic No hypoxemia
(n = 135)
Hypoxemia
(n = 71)
Age *(yrs, mean/SD) 55 ± 11 58 ± 12
Gender (M/F, %) 79%/21% 77%/23%
BMI (mean/SD)* 32 ± 6 35 ± 7
ASA physical status
(1/2/3/4, %)
1/61/37/1 1/47/52/0
Past Medical History   
CPAP at home (%) 53% 54%
COPD (%)* 3% 11%
Procedure*   
Knee arthroscopy (%) 25% 18%
Knee ACL Repair (%) 3% 3%
Hand/Forearm (%) 12% 20%
Shoulder arthroscopy (%) 33% 47%
Foot/Ankle (%) 12% 7%
Other upper extremity (%) 4% 4%
Other lower extremity (%) 11% 1%
Anesthesia*   
General only (%) 6% 4%
General + regional (%) 3% 3%
Regional only 91% 93%
   Spinal/Epidural (%) 46% 28%
   Interscalene block (%) 25% 35%
   Other nerve block (%) 21% 31%
Postoperative Analgesia   
Oral Opioids (%) 85% 92%
NSAIDs (%) 36% 39%
IV Opioids (%) 24% 32%
  1. * = Identified as potential risk factor by univariate analysis
  2. Upper extremity vs lower extremity. Regional vs General