Table 4.

Odds ratios for respiratory symptoms, according to spirometric category and stratified by ethnicity ^*

Spirometric Category †	White-Americans N=3,465		African-Americans N=1,821		Mexican-Americans N=1,716
	Odds Ratios for Respiratory Symptoms (95% Confidence Interval) ‡§
	Unadjusted	Adjusted	Unadjusted	Adjusted	Unadjusted	Adjusted
Normal	1.00
Airflow-limitation	2.70 (2.20, 3.32)	2.15 (1.70, 2.73)	1.41 (1.02, 1.94)	1.38 § (0.99, 1.92)	1.25 (0.90, 1.72)	1.26 § (0.90, 1.76)
Restrictive-pattern	2.67 (1.90, 3.76)	2.16 (1.51, 3.07)	1.41 (0.96, 2.08)	1.08 § (0.70, 1.67)	2.60 (1.92, 3.52)	2.12 (1.45, 3.08)

^*Missing data: White-Americans — 37 missing covariates and 4 missing respiratory symptoms; African-Americans — 39 missing covariates, 4 missing respiratory symptoms; Mexican-Americans — 30 missing covariates, 3 missing respiratory symptoms.

^†See footnote to Table 2 for description of spirometric category.

^‡Odds ratios were calculated using three separate logistic regression models for each ethnic group. In the adjusted models, covariates included age, sex, smoking history, high cardiovascular risk, and health status.

^§Relative to White-Americans, there were significant interactions in African-American x airflow-limitation (p=0.003), African-American x restrictive-pattern (p=0.012), and Mexican-American x airflow-limitation (p=0.001), but no significant interaction in Mexican-American x restrictive-pattern (p=0.669).