Prognostic Value of C-Reactive Protein, Leukocytes, and Vitamin D in Severe Chronic Obstructive Pulmonary Disease
Table 2
Characteristics of patients in the study group compared with excluded patients.
Group of patients
Study group
Excluded
level
423
73
—
Females, %
61.0
70.0
0.15
Age, years
68.9 (9.3)
70.5 (10.2)
0.18
Pack years
40.6 (20.8)
44.7 (23.3)
0.13
Current smoking, %
26.8
20.5
0.26
Heart disease, %
46.8
45.2
0.80
Education, years
8.8 (2.5)
9.2 (2.7)
0.25
Lived alone, %
54.3
60.3
0.34
Examined in the winter period, %
75.1
77.0
0.76
FEV1, % predicted
37.7 (13.8)
38.9 (14.9)
0.55
Prednisolone treatment, %
3.1
6.8
0.11
Long-term oxygen therapy, %
5.0
6.8
0.51
Oxygen saturation at rest, %
94.5 (2.1)
94.4 (2.0)
0.64
Oxygen desaturation during SWT > 4%, %
218 (51.5)
32 (43.8)
0.22
SWT, metre
184.5 (95.7)
180.5 (92.9)
0.74
MRC dyspnoea score
4.0 (0.9)
3.8 (1.0)
0.05
BMI, kg/m2
26.0 (6.0)
26.0 (6.5)
0.99
Admissions to hospital the previous year1,2,3
0 (0, 1)
0 (0, 2.25)
0.79
Bed days the previous days1,2,3
0 (0, 5.25)
0 (0, 0)
0.23
i-BODE index, points
6 (3)
5.5 (2.2)
0.26
Vitamin D, nmol/L2
51 (29, 70)
—
—
CRP, mg/L2
6 (4, 10)
—
—
Leukocytes, 109/L2
8.7 (7.3, 10.5)
—
—
Due to exacerbation of COPD.
2Mean (25, 75) percentiles.
3Mann-Whitney test. SWT: Shuttle walking test. MRC: Medical Research Council. BMI: body mass index.
