Figure 2From: Genetic and environmental influence on lung function impairment in Swedish twinsUnadjusted and adjusted genetic, shared and non-shared environmental variance components for VC, FEV 1 , and DLco in men and women. Variance is expressed in absolute numbers and is shown for unadjusted data (% pred), data adjusted for pack years (PY) and data adjusted for pack years and respiratory symptoms (PY + SYM).Back to article page