Table 1.
Demographic characteristic of 189 lung function tests on 126 infants.
Table 2.
Number and success rate of 189 lung function tests on 126 infants (50% male).
Table 3.
Tidal flow parameters, expressed as mean ± standard deviation, of infants in various age groups.
Fig 1.
Parameters for tidal breathing analysis.
Scatter plots of (A) TPEF/Te, (B) VPEF/Ve, and (C) Ti/Tt in tidal flow waveform are indicated against crown-heel length at the time of the test.
Fig 2.
Regression curves of various parameters.
Regression curves (means and 95% confidence bands) of various parameters including (A) tidal volume (Vt), (B) respiratory rate (RR), (C) resistance (Rrs), (D) compliance (Crs), and (E) maximal flow at functional residual capacity (VmaxFRC), plotted against crown-heel length at the time of the test.
Table 4.
Regression equations of various parameters of infant lung function.
Fig 3.
Short-term repeatability of VmaxFRC.
Bland-Altman plot of the agreement in VmaxFRC is analyzed between two measurements sets 15 min apart. Data are plotted as the difference between two measurements versus the mean of the two measurements. Differences for individuals are shown as solid circles. The mean of the differences and the upper and lower limits of agreement are plotted as solid and dash lines respectively.
Fig 4.
Comparison of various reference curves.
Present regressions of (A) Crs, (B) Rrs, and (C) VmaxFRC in this study compared with previously published data.