Table 4.

Comparison of mean (SD) ozone-induced percentage decrements in spirometric parameters by standard body mass index categories for men and women^*

Δ (%)	Underweight BMI < 18.5 (n = 5) 0M/5F	Normal Weight BMI = 18.5-24.9 (n = 135) 80M/55F	Overweight/Obese BMI ≥ 25 (n = 57) 42M/15F	Trend p-value
FEV1 All Males Females	−8.5 (5.6) −8.5 (5.6)	−15.5 (11.2) −15.2 (11.6) −15.9 (10.8)	−18.2 (10.2) −17.2 (10.0) −21.0 (10.8)	0.028 0.171 0.012
FVC All Males Females	−6.9 (4.5) −6.9 (4.5)	−10.6 (8.9) −10.0 (8.9) −11.5 (9.0)	−12.8 (8.2) −11.4 (7.6) −16.7 (8.6)	0.073 0.184 0.017
FEF25-75 All Males Females	−9.2 (8.5) −9.2 (8.5)	−24.6 (17.0) −24.5 (18.1) −24.7 (15.5)	−27.4 (15.6) −26.4 (15.4) −30.1 (16.5)	0.009 0.276 0.005
FEV1/FVC All Males Females	−1.5 (3.3) −1.5 (3.3)	−5.7 (6.0) −6.0 (6.2) −5.2 (5.9)	−6.3 (6.3) −6.6 (6.7) −5.5 (5.2)	0.046 0.313 0.090
FEF25-75/FVC All Males Females	−2.5 (7.2) −2.5 (7.2)	−16.3 (14.6) −16.7 (15.5) −15.6 (13.4)	−17.0 (15.4) −17.1 (15.7) −16.7 (15.0)	0.018 0.460 0.022

^*Centers for Disease Control and World Health Organization categories for BMI. For normal weight, FEF25-75 and FEF25-75/FVC, n = 133 with 79M/54F