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Table 2 Patients’ radiographic outcomes (mean ± SD)

From: Predictive ability of pharyngeal inlet angle for the occurrence of postoperative dysphagia after occipitocervical fusion

  Dysphagia
(26 patients)
Without Dysphagia
(72 patients)
P value
Pre ADI 0.60 ± 0.26 cm 0.59 ± 0.35 cm 0.554
Pre O-C2a 9.58 ± 10.21 4.04 ± 16.01 0.191
Pre O-EAa 104.32 ± 7.44 101.33 ± 7.94 0.169
Pre C2Ta 94.73 ± 13.52 97.42 ± 17.72 0.504
Pre C2-7a 20.48 ± 14.06 25.67 ± 18.50 0.211
Pre PIA 96.80 ± 8.00 90.06 ± 11.42 0.005*
Pre nPAS 1.25 ±0.45cm 1.34±0.48cm 0.316
Post ADI 0.33±0.14cm # 0.33±0.12cm# 0.971
Post O-C2a 0.07±9.12# 7.86±13.96# 0.005*
Post O-EAa 94.21±7.87# 101.42±6.44 0.000*
Post C2Ta 94.13±12.31 93.56±14.34# 0.863
Post C2-7a 24.60±13.27 18.00±15.58# 0.038*
Post PIA 81.85±5.51# 91.28±10.50 0.000*
Post nPAS 0.69±0.31cm# 1.43±0.50cm 0.000*
dADI -0.27±0.22cm -0.26±0.28cm 0.621
dO-C2a -9.51±5.18 3.82±11.71 0.000*
dO-EAa -10.11±5.12 0.10±7.15 0.000*
dC2Ta -0.61±5.88 -3.86±11.37 0.159
dC2-7a 4.11±13.93 -7.66±13.57 0.001*
dPIA -13.95±6.87 1.22±11.12 0.000*
dnPAS% -43.84±16.33% 16.90±59.10% 0.000*
  1. SD Standard deviation, Pre Preoperative, ADI Atlas-dens interval, O-C2a O-C2 angle, O-EAa Occipital and external acoustic meatus to axis angle, C2Ta C2 tilting angle, PIA Pharyngeal inlet angle, nPAS The narrowest oropharyngeal airway space, Post Postoperative, d The difference between pre- and postoperative values, dnPAS% (postoperative nPAS- preoperative nPAS)/preoperative nPAS*p<0.05 between groups; #p<0.05 comparing with preoperative data