TABLE 3

β coefficients for age and height as possible explanatory predictors for lung function z-scores

MalesFemales
βp-valueβp-value
FEV1 (z-score)
 Constant2.7210.636
 Age0.0090.003*0.0100.012*
 Height−1.5690.001*−0.5040.505
FVC (z-score)
 Constant1.211−0.673
 Age0.0090.001*0.0050.178
 Height−0.7510.0990.4150.562
FEV1/FVC (z-score)
 Constant2.7382.575
 Age−0.0020.5150.0060.079
 Height−1.4810.001*−1.7400.007*
FRC (z-score)
 Constant0.355−0.896
 Age−0.0030.251−0.0020.481
 Height−0.1770.6600.7560.239
TLC (z-score)
 Constant0.647−1.470
 Age0.0050.0820.0050.139
 Height−0.4420.3160.8410.219
RV (z-score)
 Constant0.4750.451
 Age0.0040.054−0.0040.089
 Height−0.1600.6160.2100.672
DLCO (z-score)
 Constant3.167−0.880
 Age−0.0020.430−0.0110.003*
 Height−1.783<0.001*0.8050.246
VA (z-score)
 Constant1.706−1.634
 Age0.0040.1080.0030.454
 Height−1.0930.017*0.8650.218
KCO (z-score)
 Constant2.075−0.205
 Age−0.0040.097−0.0120.001*
 Height−1.0510.010*0.4600.496

Age in years and height in metres. FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; RV: residual volume; FRC: functional residual capacity; TLC: total lung capacity; DLCO: diffusing capacity of the lung for carbon monoxide; VA: alveolar volume; KCO: transfer coefficient of the lung for carbon monoxide. Significant correlations are indicated: *: p<0.05.