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Table 4 Results from the multiple regression model of DF, based on adults only

From: Deposition efficiency of inhaled particles (15-5000 nm) related to breathing pattern and lung function: an experimental study in healthy children and adults

  Unstandardized coefficients Standardized coefficients  
Size intervals Const. Tbc [min] VDaw [L] R5 sss [kPa · s · L−1] VT [L] Tbc VDaw R5 VT R
15–30 0.60 1.07* −0.76* 0.10** 0.14* 0.37 −0.50 0.09 0.33 0.835
30–50 0.37 1.15* −0.67* 0.30* 0.18* 0.34 −0.38 0.23 0.35 0.824
50–100 0.19 1.69* −0.38* 0.29* 0.09 0.51 −0.22 0.23 0.17 0.774
100–200 0.22 1.19* −0.51* 0.10 0.04 0.46 −0.38 0.10 0.09 0.677
200350 0.17 0.94* −0.30* 0.07 0.03 0.94 −0.30 0.07 0.03 0.642
8501250 0.19 2.47* −0.23* 0.10 −0.05 0.81 −0.14 0.08  −0.11 0.750
1300–1900 0.23 2.29* −0.28* 0.18** 0.05 0.67 −0.16 0.14 0.10 0.815
1900–2700 0.40 1.63* −0.62* 0.15** 0.15 0.49 −0.34 0.11 0.29 0.830
2700–3500 0.52 0.98* −0.40* 0.19** 0.15** 0.37 −0.28 0.19 0.36 0.798
3500–5000 0.62 (0.70) 0.43* (0.34) 0.30 0.29** (0.20) 0.04 (0.07) 0.20 (0.16) 0.25 0.34 (0.24) 0.12 (0.20) 0.496
  1. The multiple regressions include the variables Tbc (time of a breath cycle), VDaw (anatomical dead space), R5 (airway resistance at 5 Hz), and VT (tidal volume). R is the multiple correlation coefficient
  2. For the largest particles, the analysis was made with and without VDaw (latter value in parentheses). Standardized coefficients give an indication of the effect of each independent variable on the dependent variable (standardizing the variables before running the regression results in all variables being on the same scale)
  3. Significance on a 0.05 level is indicated by*
  4. Significance on the same level (0.05) when also including the children is indicated by**