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Forest plots of the association between the VDBP polymorphism and risk of COPD (analysis of homozygous genes vs. other genotypes). (A) 1F-1F vs. 1F-1S+1S-1S+2-1S+2-1F+2-2; (B) 1S-1S vs. 1F-1F+1F-1S+2-1S +2-1F+2-2; (C) 2-2 vs. 1F-1F+1F-1S+1S-1S+2-1S+2-1F. VDBP, vitamin D binding protein; COPD, chronic obstructive pulmonary disease.
