TABLE 3

Coefficients of determination (r²) for relationship between oscillometry values and World Trade Center dust exposure

	Acute exposures		Chronic exposures
	Dust cloud density	Time in dust cloud	Dust at home/work	Smoke at home/work	Time at home/work	Cleaning home/work
R₅	0.0003	0.0022	0.0004	0.0097	0.0146	0.0009
R₂₀	<0.0001	<0.0001	<0.0001	0.0121	0.0160	0.0010
R_5–20	0.0021	0.0140	0.0028	0.0006	0.0022	0.0002
X₅	0.0004	0.0192	0.0013	0.0006	0.0017	<0.0001
AX	0.0001	0.0141	0.0013	0.0038	0.0050	0.0009
f_res	0.0012	0.0070	0.0021	0.0003	0.0003	0.0011

R₅: resistance at an oscillating frequency of 5 Hz; R₂₀: resistance at an oscillating frequency of 20 Hz; R_5–20: difference between resistance at 5 and 20 Hz; X₅: reactance at an oscillating frequency of 5 Hz; AX: area under the reactance curve from 5 Hz to the resonant frequency; f_res: resonant frequency.