Table 4—

Correlation coefficients (r) and significant levels (p) between mean individual ages and annual individual changes of forced expiratory volume in one second (FEV1) or forced vital capacity (FVC) in 52 cystic fibrosis patients

Change of FEV1Change of FVC
rprp
% pred Z0.400.0030.310.03
% pred K0.300.030.05NS
% pred Q0.09NS0.11NS
% pred W0.09NS0.19NS
  • Z: using reference equation described in Zapletal et al. 9

  • K: using reference equation described in Knudson et al. 8

  • Q: using reference equation described in Quanjer et al. 4

  • W: using reference equation described in Wang et al. 6

  • NS: nonsignificant