IL1B and chronic obstructive pulmonary disease: The level of SP-A [Healthy: 47.9 (34.8–96.8); COPD: 50.5 (44.6–98.7); p = 0.285] or IL-1β [Healthy: 15.7 (1.6–39.3); COPD: 35.7 (15.3–71.3); p = 0.236] protein did not differ between participants with COPD and healthy controls.