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

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