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Table 1 Inclusion and exclusion criteria

From: The usefulness of MMP-9, TIMP-1 and MMP-9/TIMP-1 ratio for diagnosis and assessment of COPD severity

Inclusion criteria

Exclusion criteria

Adults ≥ 40 years of age

Diagnosis of asthma or any other chronic respiratory disease

Diagnosis of COPD at least 6 months prior to enrollment

Immunosuppression of any kind

Diagnosis according to the Global Initiative for Chronic Obstructive Disease (GOLD)

Refusal to give informed consent

At least one spirometry measurement in the last year with a postbronchodilator, FEV1/FVC < 0.70

Any acute or chronic condition that would limit the ability of the patient to participate in the study

Stable disease (no recent exacerbation for at least 4 weeks prior to enrollment)

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