Table 5

Predictors of lung function parameters given as the results of adjusted linear regression analyses Y = β0 + β1 h + β2 w + β3 a + β4 m + β5 b, where h = height (cm), w = weight (kg), a = age (months), m = an indicator of three acceptable manoeuvres. and b = an indicator of a boy. Y is one of the lung volume measures FEV05, FEV1, FVC and PEF.

Lung volume measureβ0β1 (SE)β2 (SE)β3 (SE)β4 (SE)β5 (SE)RSDR2
FEV1, FEV0.5=forced expiratory volume in 1 or 0.5 seconds; FVC=forced vital capacity; PEF=peak expiratory flow; RSD=residual standard deviation; R2=explained fraction of variance; SE=standard error of regression parameter. Slopes β1, β2 and β3 represent the change per unit change in the respective explanatory variable. Coefficients β4 and β5 give the difference between two groups.
FEV0.5 (l)–0.840.0119 (0.0013)0.0105 (0.0024)0.0044 (0.0009)0.038 (0.012)0.026 (0.011)0.130.59
FEV1 (l)–1.330.0161 (0.0017)0.0152 (0.0029)0.0057 (0.0011)0.062 (0.015)0.046 (0.014)0.170.64
FVC (l)–1.570.0171 (0.0019)0.0169 (0.0033)0.0072 (0.0012)0.058 (0.017)0.058 (0.015)0.190.64
PEF (l/s)–2.210.0289 (0.0047)0.0238 (0.0082)0.0217 (0.0030)0.114 (0.042)0.052 (0.038)0.470.53