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Fig. 3 Bland-Altman plot of actual postoperative FEV1 (in
liters) and predicted postoperative FEV1 (in liters) using
ventilation scintigraphy. If this relationship were perfect (no bias), all
points would lie close to zero line on x-axis. Most points lie
beneath this line, indicating that ventilation scintigraphy underestimates
actual postoperative lung function.