Analysis of bacterial spectrum, activin A, and CD64 in chronic obstructive pulmonary disease patients complicated with pulmonary infections

Table 1 Comparison of baseline characteristics between the chronic obstructive pulmonary disease patients with pulmonary infections and those without

Baseline characteristics	The control group	The pulmonary infection group	χ2	P value
Cases, n	96	85
Gender (male/female)	59/37	50/35	0.131	0.718
Age range (yr)	67.44 ± 8.51	68.83 ± 8.90	1.073	0.285
Course of disease (yr)	16.35 ± 7.68	17.13 ± 8.06	0.666	0.506
Smoking history, n (%)	68 (70.83)	65 (76.47)	0.735	0.391
FEV1 (%)	47.65 ± 10.07	41.30 ± 9.91	4.266	< 0.001
FEV1/FVC (%)	58.24 ± 8.62	50.48 ± 9.13	5.879	< 0.001

FEV1: Forced expiratory volume in the first second; FVC: Forced vital capacity.

Table 2 The bacterial spectrum of patients in the pulmonary infection group

Bacteria	Strains	Proportion (%)
Gram-negative bacteria	49	57.65
Pseudomonas aeruginosa	16	18.82
Klebsiella pneumoniae	14	16.47
Haemophilus influenzae	7	8.24
Haemophilus parainfluenzae	7	8.24
Others	5	5.88
Gram-positive bacteria	35	41.18
Streptococcus pneumoniae	24	28.24
Staphylococcus epidermidis	11	12.94
Fungus	1	1.17
Total	85	100.00