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Table 3 Number of normal and abnormal test results divided according to the current diagnostic status among 58 double lung transplant recipients.

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

  Dimension Cut off value NoBOS BOS BOS 0-p
    Normal Abnormal Normal Abnormal Normal Abnormal
FEV1 % basal < 90 264 28 0 37 0 7
FVC % basal < 90 276 11 8 27 5 1
N2 slope % basal > 299 240 12 12 13 4 3
FEV1 % pred. < 49 279 14 12 24 7 0
FVC % pred. < 52 275 13 24 10 6 0
N2 slope % pred. > 478 234 18 1 24 0 7
  1. Cut off values are based on the 43 patients who did not develop BOS or BOS 0-p and are chosen to give 95% specificity except for FEV < 90% of the basal value.
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