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We also found no evidence of a higher risk of COPD among African-Americans in contrast to a case-control study of 70 cases of early-onset COPD,8 a retrospective review of step step 160 patients presenting for lung volume reduction surgery,9 and a prospective study of 50 African-Americans and 278 Caucasians,10 all using self-reported race/ethnicity. One explanation for these differences is that prior findings in http://datingranking.net/local-hookup/lincoln/ early-onset and very severe COPD may not apply to the general population and, conversely, findings in the general population may not apply to these extreme phenotypes. Notably, a more recent study incorporating genetic measures by Aldrich et al11 used AIMs and identified a trend, though non-significant, toward an interaction between African ancestry and smoking on FEV1 in cross-sectional and longitudinal analysis among self-reported African-Americans. These findings were not replicated in our present study. Differences include an older cohort with a higher mean pack-years (30) among the participants in the study by Aldrich et al as well as the longitudinal approach, suggesting that it could be possible that there is more variability by race as individuals age. Our results are, however, consistent with a large meta-analysis of population-based studies using self-reported race-ethnicity.7

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We found no evidence of a differential risk in this group for FEV1 to FVC ratio, airflow limitation and per cent emphysema; however, the association between cumulative smoking and FEV1 was modified by genetic ancestry among men of Chinese-American ancestry. These results build on findings from the prior meta-analysis of lung function, which found that self-reported Asian/Pacific Islanders had smaller smoking-related decrements in FEV1 than Caucasians.7 The specificity of the interaction in FEV1 suggests that it ong Asian men compared with other race/ethnic groups that are not fully indexed by height.21 Other possible explanations for this difference include dietary and lifestyle factors. Continue reading