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

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

	Unstandardized coefficients					Standardized coefficients
Size intervals	Const.	T_bc [min]	V_Daw [L]	R5 sss [kPa · s · L⁻¹]	V_T [L]	T_bc	V_Daw	R5	V_T	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
200–350	0.17	0.94*	−0.30*	0.07	0.03	0.94	−0.30	0.07	0.03	0.642
850–1250	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

The multiple regressions include the variables T_bc (time of a breath cycle), V_Daw (anatomical dead space), R5 (airway resistance at 5 Hz), and V_T (tidal volume). R is the multiple correlation coefficient
For the largest particles, the analysis was made with and without V_Daw (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)
Significance on a 0.05 level is indicated by*
Significance on the same level (0.05) when also including the children is indicated by**

ISSN: 1743-8977