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Table 2 Relationships between measurement differences (|PaCO 2 -PtCO 2 |) and patient characteristics, univariate and multivariate analysis (ANCOVA)

From: Concordance and limits between transcutaneous and arterial carbon dioxide pressure in emergency department patients with acute respiratory failure: a single-center prospective observational study

  Univariate analysis Multivariate analysis
Variable OR [95% CI] P-value OR [95% CI] P-value
Sex 1.61 [0.18-14.25] 0.66   
Past medical history
Acute pulmonary edema 0.29 [0.03-2.96] 0.29   
COPD 0.60 [0.06-6.18] 0.67   
Ischemic heart disease 0.75 [0.06-8.91] 0.82   
Home oxygen 1.01 [0.06-16.77] 0.99   
Heart rate 0.98 [0.94-1.03] 0.40   
Systolic blood pressure 1.01 [0.97-1.05] 0.60   
Diastolic blood pressure 0.97 [0.91-1.03] 0.33   
Respiratory rate 1.01 [0.88-1.18] 0.85   
Temperature 2.45 [0.93-6.49] 0.07 3.01 [1.16-7.80] 0.03
PaCO 2 1.05 [1.00-1.12] 0.06 1.06 [1.00-1.12] 0.05
PtCO 2 1.06 [1.00-1.13] 0.06   
PaO 2 1.21 [1.01-1.45] 0.04 1.22 [1.02-1.47] 0.03
HCO 3 0.96 [0.80-1.15] 0.64   
Base excess 0.96 [0.82-1.12] 0.60   
Lactate 1.44 [0.43-4.79] 0.54   
Hemoglobin 1.20 [0.74-1.95] 0.45   
White blood cells 0.91 [0.74-1.12] 0.38   
C-reactive protein 1.00 [0.99-1.01] 0.72   
Glycemia 4.70 [0.62-35.58] 0.13   
Brain natriuretic peptide 1.00 [1.00-1.00] 0.82   
  1. ANCOVA: Analysis of covariance; COPD: Chronic obstructive pulmonary disease; CI: Confidence interval; PaCO 2 : Partial pressure of carbon dioxide in the blood; PtCO 2 : Transcutaneous partial pressure of carbon dioxide in the blood; PaO 2 : Partial pressure of dioxygen in the blood.