The Relationship of Partial Pressure of Carbon Dioxide (PaCO₂) with Disease Severity Indicators Such as BODE and GOLD in Hospitalized COPD Patients

Table 1

Baseline characteristics of COPD patients according to disease severity (BODE < 5 or BODE ≥ 5).

	BODE < 5 (n = 50)	BODE ≥ 5 (n = 23)
Age (years)	71.26 ± 7.75	70.26 ± 7.72	0.610
Sex (male, n%)	41(82.00%)	19 (82.61%)	1.000
Duration of disease (years)	6 (3–12)	11(6–12)	0.051
Smoking (n%)	40 (80.00%)	18 (36.00%)	1.000
BMI (kg/m^2)	22.03 ± 3.51	18.74 ± 3.19	<0.001
pH	7.42 ± 0.03	7.39 ± 0.04	<0.001
pH on day 7 of admission	7.41 ± 0.03	7.39 ± 0.04	0.172
FEV1%	44.94 ± 13.73	28.86 ± 11.36	<0.001
PaCO2 (mmHg)	41.77 ± 5.22	49.75 ± 11.55	0.004
PaO2 (mmHg)	74.64 ± 10.62	72.89 ± 17.89	0.665

Data are presented as mean ± SD unless indicated otherwise. COPD, chronic obstructive pulmonary disease; BMI, body mass index; FEV₁%, forced expiratory volume in 1 second in percent of the predicted value; PaCO2, partial pressure of carbon dioxide in arterial blood; PaO2, partial pressure of oxygen in arterial blood; SD, standard deviation.