ORs for respiratory symptoms, according to spirometric category and stratified by ethnicity*
| Spirometric category† | White Americans N=3465 | African Americans N=1821 | Mexican Americans N=1716 | |||
|---|---|---|---|---|---|---|
| ORs for respiratory symptoms (95% CI)ठ| ||||||
| Unadjusted | Adjusted | Unadjusted | Adjusted | Unadjusted | Adjusted | |
| Normal | 1.00 | |||||
| Airflow limitation | 2.70 (2.20 to 3.32) | 2.15 (1.70 to 2.73) | 1.41 (1.02 to 1.94) | 1.38 (0.99 to 1.92)§ | 1.25 (0.90 to 1.72) | 1.26 (0.90 to 1.76)§ |
| Restrictive pattern | 2.67 (1.90 to 3.76) | 2.16 (1.51 to 3.07) | 1.41 (0.96 to 2.08) | 1.08 (0.70 to 1.67)§ | 2.60 (1.92 to 3.52) | 2.12 (1.45 to 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.
‡ORs 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×airflow limitation (p=0.003), African American×restrictive pattern (p=0.012) and Mexican American×airflow limitation (p=0.001), but no significant interaction in Mexican American×restrictive pattern (p=0.669).