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Table 5 Results of FEV1 and the N2 test from 6 to 24 months post transplantation.

From: Prediction of BOS by the single-breath nitrogen test in double lung transplant recipients

  Definition of abnormal Total number of test results Total number of abnormal results Number of abnormal results preceding BOS Predictive value (%)
FEV1 < 90% basal 299 28 11 39
N2 test > 478% pred. 259 22 12 55
FEV1 + N2 test Both definitions 259 12 9 75
  1. Results in NoBOS patients and in those preceding the diagnosis of BOS are included