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. 2016 Oct 5;11:2497–2507. doi: 10.2147/COPD.S111145

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© 2016 Grigsby et al. This work is published and licensed by Dove Medical Press Limited

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Absolute difference in pre-bronchodilator FEV₁/FVC Z-score by socioeconomic status composite index (SES index), secondary education or higher (below secondary as reference), greater than or equal to household size of 4 (below as reference), and monthly household income (change per category).

Notes: We display adjusted differences in pre-bronchodilator FEV₁/FVC Z-score for the overall sample (left) and for individual sites (right). In the left panel, the square represents the adjusted odds ratio and the segments represent 95% CIs. In the right panel, the triangles represent site-specific adjusted odds ratios. For the composite SES index, we calculate the interquartile adjusted difference in pre-bronchodilator FEV₁/FVC Z-score, ie, the difference between the 75th and 25th percentiles of the composite SES index.

Abbreviation: SES, socioeconomic status.