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Table 4 Univariable Poisson regression of factors associated with arytenoid dislocation

From: Head-neck movement may predispose to the development of arytenoid dislocation in the intubated patient: a 5-year retrospective single-center study

Variable IRR 95% CI P-value
Patient characteristic
 Age 0.974 0.951–0.997 0.026
 Gender
   Male 1.0   
   Female 2.912 1.335–7.280 0.012
 ASA physical status
  I 1.0   
  II 0.500 0.247–1.031 0.055
  III 0.331 0.052–1.185 0.144
  IV 0.000 0.000–0.000 0.986
 Height 0.991 0.952–1.032 0.664
 Body weight 1.002 0.972–1.030 0.914
 Body mass index 1.013 0.921–1.107 0.781
 Short neck 0.000 0.987
 Mouth opening limitation 0.000 0.984
Anaesthetic factor
 Cormack Lehane grade
  1 1.0  
  2 0.592 0.280
  3 0.000 0.986
  4 0.000 0.998
 Number of intubation attempts
  1 1.0  
  2 1.111 0.917
  3 0.000 0.987
  4 0.000 0.996
 Endotracheal tube ballooning 1.1525 0.046–3.796 0.984
 Stylet use 0.818 0.017–1.370 0.843
 BURP maneuver 0.295   0.229
 Tracheal intubation tool
  Conventional laryngoscope 1.0   
  Video–laryngoscope 0.000 0.987
  Lightwand 0.000 0.998
  Fiberoptic laryngoscopy 0.000 0.998
 Esophageal stethoscope 0.768 0.274–3.205 0.663
 Monitoring of neuromuscular blockade 0.537 0.227–1.139 0.126
 Armoured tube 4.082 0.229–18.953 0.166
 Tracheal intubation by 1st-yr anesthesia resident (vs higher than 1st resident and staff) 2.206 1.030–4.454 0.032
Surgical factor
 Duration of surgery (min)
   < 120 1.0   
  120–240 1.129 0.503–2.689 0.773
   > 240 1.674 0.654–4.288 0.274
 Pneumoperitoneum 0.472 0.176–1.067 0.096
aPositions with head-neck movement (vs positions without head-neck movement) 2.925 1.439–5.803 0.002
  1. aHead-neck movement includes extension, flexion, rotation, and flexion-rotation. ASA American Society of Anesthesiologists, BURP backward upward rightward pressure, IRR incidence rate ratio, CI confidence interval