Figure 1From: Prediction of BOS by the single-breath nitrogen test in double lung transplant recipientsRatio of FEV1 < 90% basal and N2-test > 478% predicted over time. Figure 1 illustrates the number of occasions over time (n = 12) when the test results of both FEV1 < 90% basal and N2-test > 478% predicted were abnormal. Black bars denote when abnormal values preceded BOS (n = 9).Back to article page