In addition, compared with controls, significantly higher levels of adiponectin (7.81±4.37 μg/ml compared with 5.64±2.69 μg/ml, P=0.005) and CRP (2.93±3.32 μg/ml compared with 0.97±1.08 μg/ml, P<0.0001) were found in COPD patients (Table 2). Here, CRP is linked to chronic obstructive pulmonary disease.