Table 5.

Relationship between age, body mass index, minute ventilation (Ve) and change in pulmonary function parameters after ozone exposure for subset of subjects having Ve measures during exposure. Beta is the coefficient for the associated predictor in the regression model and the square of the regression coefficient, R², applies to the regression model that includes both predictors, age and BMI.

		All (n = 127)		Males (n = 80)		Females (n = 47)
Δ (%)	Predictor	Beta	p-value	Beta	p-value	Beta	p-value
FEV1	Age	0.416	0.08	0.011	0.97	0.749	0.035
	BMI	−0.797	0.019	−0.313	0.54	−1.116	0.020
	Ve	0.181	0.38	−0.222	0.60	0.704	0.11
	R2	0.059		0.018		0.222
FVC	Age	0.338	0.08	0.016	0.09	0.602	0.044
	BMI	−0.635	0.020	−0.244	0.54	−0.814	0.042
	Ve	0.192	0.24	−0.267	0.42	0.518	0.17
	R2	0.060		0.028		0.190
FEF25-75a	Age	0.388	0.28	−0.194	0.70	0.789	0.11
	BMI	−1.253	0.013	−0.198	0.80	−2.108	0.002
	Ve	0.218	0.48	−0.429	0.51	1.061	0.09
	R2	0.054		0.015		0.256
FEV1/FVC	Age	0.120	0.36	0.020	0.92	0.194	0.29
	BMI	−0.241	0.19	−0.102	0.72	−0.426	0.09
	Ve	0.010	0.93	0.031	0.90	0.266	0.25
	R2	0.021		0.002		0.103
FEF25- 75/FVCa	Age	0.155	0.63	−0.198	0.67	0.345	0.43
	BMI	−0.823	0.07	0.042	0.95	−1.645	0.007
	Ve	0.054	0.85	−0.288	0.62	0.734	0.19
	R2	0.030		0.006		0.173