ADIPOQ and chronic obstructive pulmonary disease: Regarding the causal relationship between adiponectin and sarcoidosis, asthma, COPD, lung cancer, tuberculosis, pneumonia, and sleep apnea syndrome, the IVW test results were as follows: (OR = 0.85, 95% CI 0.66–1.09, P = 0.208; OR = 0.99, 95% CI 0.98–1.01, P = 0.431; OR = 0.99, 95% CI 0.99–1.00, P = 0.998; OR = 0.91, 95% CI 0.75–1.11, P = 0.353; OR = 1.00, 95% CI 0.99–1.00, P = 0.607; OR = 0.97, 95% CI 0.86–1.10, P = 0.710; OR = 1.05, 95% CI 0.95–1.16, P = 0.352).