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Table 2 Univariate analysis for all demographic and clinical variables pertinent to diagnosis of pulmonary embolism (n = 100)

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

Variable** PE
(n = 41)
No PE
(n = 59)
P value#
Demographic data    
Age (mean ± SD) 71 ± 13 70 ± 11 0.752
Gender (M/F) 15/26 33/26 0.057
Previous DVT or PE (Y/N) 10/31 2/57 0.001
Smoker (Y/N) 5/36 25/34 0.001
Thromboembolic risk factors    
Surgery or fracture within 1 month (Y/N) 9/32 6/53 0.105
Malignancy (Y/N) 10/31 6/53 0.056
Hormone therapy (Y/N) 2/39 1/58 0.359
Palpitation (Y/N) 8/33 18/41 0.218
Calf pain (Y/N) 9/32 10/49 0.531
Relatively asymptomatic (Y/N) 2/39 0/59 0.087
Thrombophlebitis (Y/N) 2/39 0/59 0.087
Unilateral leg swelling (Y/N) 6/35 2/57 0.041
Cyanosis (Y/N) 10/31 1/58 < 0.001
Chronic venous insufficiency (Y/N) 1/40 2/57 0.784
COPD (Y/N) 10/31 10/49 0.360
Heart failure (Y/N) 18/23 38/21 0.042
Hemiparesis (Y/N) 2/39 4/55 0.694
Immobilization (Y/N) 4/37 2/57 0.187
Suspected DVT 6/35 3/56 0.101
Family history of venous thromboembolism (Y/N) 2/39 0/59 0.087
Clinical symptoms and signs    
Syncope (Y/N) 19/22 28/31 0.912
Pulse (1/min) 104 ± 18 93 ± 13 0.001
PaCO2 (mmHg) 36 ± 4 41 ± 6 < 0.001
PaO2 (mmHg) 9 ± 1 12 ± 1 < 0.001
Dyspnea (sudden onset) (Y/N) 39/2 57/2 0.709
Pleural chest pain (Y/N) 27/14 48/11 0.078
Hemoptysis (Y/N) 2/39 2/57 0.709
Sweating (Y/N) 4/37 3/56 0.368
SpO2 (%) 87 ± 6 88 ± 7 0.655
D-Dimer (mg/L) 2010 ± 804 1238 ± 692 < 0.001
Cough (Y/N) 12/29 18/41 0.894
PetCO2 (mmHg) 25 ± 2 32 ± 4 < 0.001
Body temperature (°C) 36.8 ± 0.4 36.9 ± 0.4 0.641
Systolic BP (mmHg) 113 ± 21 122 ± 30 0.116
Diastolic BP (mmHg) 71 ± 12 71 ± 16 0.794
Crackles on auscultation (Y/N) 18/23 25/34 0.879
Respiratory rate (1/min) 23 ± 5 21 ± 2 0.024
  1. BP = blood pressure; COPD = chronic obstructive pulmonary disease; DVT = deep venous thrombosis; F = female; M = male; N = no; PaCO2 = partial pressure of arterial carbon dioxide; PaO2 = partial pressure of arterial oxygen; PE = pulmonary embolism; PetCO2 = partial pressure of end-tidal carbon dioxide; SD = standard deviation; SpO2 = peripheral oxygen saturation; Y = yes;
  2. ** Results are presented as mean +/- standard deviation for normally distributed data or ratio or percentage of other variables.
  3. # Univariate comparison was made with chi-square test for categorical variables and t test for continuous variables. For evaluation of diagnostic accuracy, patients were divided into two groups: with PE and without PE.