HRs for 5-year mortality, according to spirometric category and stratified by ethnicity*
| Spirometric category† | White Americans N=3467 | African Americans N=1821 | Mexican Americans N=1717 | |||
|---|---|---|---|---|---|---|
| HRs for 5-year mortality (95% CI)ठ| ||||||
| Unadjusted | Adjusted | Unadjusted | Adjusted | Unadjusted | Adjusted | |
| Normal | 1.00 | |||||
| Airflow limitation | 2.31 (1.75 to 3.06) | 1.66 (1.23 to 2.25) | 2.58 (1.91 to 3.50) | 1.60 (1.09 to 2.36) | 2.18 (1.39 to 3.40) | 1.80 (1.17 to 2.76) |
| Restrictive pattern | 3.10 (2.30 to 4.17) | 2.56 (1.84 to 3.55) | 2.91 (1.88 to 4.50) | 3.23 (2.06 to 5.05) | 2.88 (1.34 to 6.21) | 2.09 (0.89 to 4.90) |
*Missing data: white Americans—37 missing covariates, 2 missing mortality; African Americans—39 missing covariates; and Mexican Americans—30 missing covariates, 2 missing mortality.
†See footnote to table 2 for description of spirometric category.
‡Values were calculated using three separate Cox regression models for each of the ethnic groups. In the adjusted models, covariates included age, sex, smoking history, high cardiovascular risk and health status. In white Americans there was an age by time interaction added to the model, while in African Americans age2, and age3 were also included.
§Relative to white Americans, there were no significant interactions in African American×airflow limitation (p=0.673), African American×restrictive pattern (p=0.973), Mexican American×airflow limitation (p=0.253) and Mexican American×restrictive pattern (p=0.189). These results suggest that the adjusted HRs did not differ significantly by ethnicity.