He stated that the reason for thisis unclear, but it does suggest that these individuals are notas healthy as described.[20] According to this study there was no significant difference in the level of CRP between the control group and the COPD group, while there was a significant difference in the level of CRP between the control group and the COPD with cardiovascular complication where it was higher in the latter. Here, CRP is linked to chronic obstructive pulmonary disease.