The Effect of Ventilation, Age, and Asthmatic Condition on Ultrafine Particle Deposition in Children

Table 3

Summary of total deposited fraction values.

Characteristic	Asthmatic	Nonasthmatic	Effect	Notes
Mean	.544	.476	14%	All subjects
Adjusted Means	.552	.458	21%	ANCOVA
ICRP for 15 year olds^*	.507	.438	16%	Based on distinct 𝑓 and 𝑉𝑡 values as shown in Table 2
ICRP for 10 year olds^*	.501	.475	5%	Based on distinct 𝑓 and 𝑉𝑡 values as shown in Table 5

^* Estimated for an aerosol of GMD = 30 nm, 𝜎_𝑔 2.0, and total concentration 1.2 × 10⁶ particles cm⁻³.