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. 2019 Jul 7;47(9):4114–4125. doi: 10.1177/0300060519856465

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© The Author(s) 2019

Creative Commons Non Commercial CC BY-NC: This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 4. — Correlation analyses between serum SPINA-GD level and FEV₁/FVC (RF2). The correlation between SPINA-GD and FEV₁/FVC was r = 0.421 (RF2 group), P < 0.05. There was no correlation between SPINA-GD and FEV₁ in the NRF group or in the normal control group. There was also no correlation between SPINA-GD and FEV₁/FVC in the NRF group or in the normal control group. SPINA-GD, sum activity of peripheral deiodinases; FEV₁, forced expiratory volume in 1 s; FVC, forced vital capacity; RF2, type II respiratory failure; NRF, no respiratory failure.