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Fig. 2B —Correlation between each version of predicted postoperative forced expiratory volume in first second of expiration (FEV₁), expressed as percentage of predicted value, and actual postoperative FEV₁. Graph shows postoperative FEV₁ predicted from quantitative assessment of CT scans correlates well (r =0.88, p < 0.0001) with actual postoperative FEV₁.