Table 2.

P Values for Main Effect Terms for the Forced Expiratory Volume in 1 Second and the Forced Vital Capacity Among Women in the Third National Health and Nutrition Examination Survey Sample (1988–1994), With Final Reference Equations on an Additive Scale

	P Values for Main Effect Terms
	Intercept	Age	Age2	Height2	African American	Mexican American
FEV1 model, mL
Full model without interaction terms for race/ethnicity		<0.001	0.0011	<0.001	<0.001	0.23
Without main effect term for Mexican-American ethnicity		<0.001	0.0013	<0.001	<0.001
FVC model, mL
Full model without interaction terms for race/ethnicity		0.91	<0.0001	<0.0001	<0.0001	0.077
Without main effect term for age			<0.0001	<0.0001	<0.0001	0.077
Without main effect term for Mexican-American ethnicity			<0.0001	<0.0001	<0.0001

	Final Reference Equation
	Intercept		Age		Age2		Height2		African American
	Beta Coefficient	95% CI	Beta Coefficient	95% CI	Beta Coefficient	95% CI	Beta Coefficient	95% CI	Beta Coefficient	95% CI
FEV1 model, mL	836.0	621.9, 1,050.0	−13.67	−19.69, −7.658	−0.0993	−0.1598, −0.0388	0.1086	0.1019, 0.1154	−458.8	−491.5, −426.2
FVC model, mL	−66.12	−146.0, 278.2			−0.2083	−0.2191, −0.1976	0.1488	0.1408, 0.1569	−596.3	−635.7, −556.9

Abbreviations: CI, confidence interval; FEV₁, forced expiratory volume in 1 second; FVC, forced vital capacity.