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Table 2 Univariate and multivariate logistic regression model to identify factors associated with positional and non-positional obstructive sleep apnea

From: Role of drug-induced sleep endoscopy in evaluation of positional vs non-positional OSA

Variables Univariate Multivariate
Odds Ratio (95% CI) P value Odds Ratio (95% CI) P value
Demographic data
 Sex 1.56 (0.76–3.20) .222 0.86 (0.24–3.11) .819
 Age, years 0.99 (0.95–1.02) .438   
 BMI, kg/m2 1.20 (1.11–1.30) < 0.001 1.11 (0.97–1.28) .137
 Neck circumference, cm 1.18 (1.08–1.29) < 0.001 0.95 (0.78–1.16 .629
 Epworth Sleepiness Scale 0.97 (0.91–1.04) .419   
Physical Examination
 Tonsil Size 0.95 (0.61–1.48) .822   
 Modified Mallampati score 2.20 (1.30–3.73) .003 1.49 (0.75–2.99) .258
 Retrognathia 1.08 (0.44–2.67) .867   
Sleep Study Data
 AHI, events/hr 1.05 (1.04–1.07) < 0.001 1.04 (1.03–1.06) < 0.001
DISE findings
 Velum
  A-P 0.70 (0.48–1.02) .062 1.28 (0.79–2.07) .310
  Concentric 1.74 (1.19–2.56) .004 0.93 (0.58–1.49) .767
 Oropharynx
  Lateral 2.55 (1.64–3.97) < 0.001 1.90 (1.08–3.33) .027
 Tongue base
  A-P 1.86 (1.22–2.82) .004 1.27 (0.75–2.13) .371
 Epiglottis
  A-P 1.30 (0.86–1.97) .220 1.64 (0.94–2.83) .079
  Lateral 1.46 (0.78–2.70) .235 1.54 (0.72–3.33) .268
  1. BMI Body Mass Index, AHI Apnea-Hypopnea Index, ODI Oxygen Desaturation Index, A-P Anteroposterior