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Plot of a linear association between log-transformed serum 25OHD (nmol/l) concentrations and FEV1 % predicted (%) (p = 0.02, adjusted r = 0.12). Linear trends were tested for significance by regressing log-transformed 25OHD levels on FEV1 % predicted, with adjustment for age (years), sex, BMI (<23, 23–26.9, or ≥27), smoking (current, former, or never), season of blood collection, disease duration (years), and other confounders.
