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Table 3 Logistic regression analysis of factors used for confirmation of PE in patients with positive D-dimer in prehospital emergency setting

From: Capnometry in suspected pulmonary embolism with positive D-dimer in the field

Factor OR (95% CI)** P value#
PaCO2 9.8 (4.2-15.1) < 0.001
PaO2 14.1(6.9-27.4) < 0.001
D-dimer 15.3 (6.3-25.8) < 0.001
PetCO2 7.4 (2.8-17.8) < 0.001
Cianosis 6.2 (1.8-13.1) 0.013
Previous DVT or/and PE 6.8 (1.5-11.7) 0.021
Smoker 0.14 (0.04-0.34) < 0.001
  1. CI = confidence interval; DVT = deep venous thrombosis; PaCO2 = partial pressure of arterial carbon dioxide; PaO2 = partial pressure of arterial oxygen; PE = pulmonary embolism; PetCO2 = partial pressure of end-tidal carbon dioxide; OR = odds ratio.
  2. ** Univariable screening was performed on clinical, historical and biochemical variables to identify potential predictors of PE. Odds ratios for the presence of PE were generated and expressed with 95% CI.
  3. # Multivariable analysis with logistic regression was used to identify potential predictor variables of a final diagnosis of PE (variables from univariate analysis with P < 0.05. For entry into model).