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. 2018 Aug 28;13:2613–2622. doi: 10.2147/COPD.S166919

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© 2018 Carson et al. This work is published and licensed by Dove Medical Press Limited

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Mean (SE bars) 25(OH)D concentration for housebound (n=16) and nonhousebound (n=35) COPD patients at the end of winter and at the end of summer. Notes: Differences in 25(OH)D concentration between housebound and nonhousebound patients, within each season tested using independent samples t-test and differences in 25(OH)D concentration for each group between each season tested using paired samples t-test (conducted on log transformed data. Dashed lines represent the level of vitamin D sufficiency (25(OH)D ≥50 nmol/L) and deficiency (25(OH)D ⩽25 nmol/L). *P⩽0.05, **P⩽0.001.

Abbreviations: 25(OH)D, 25-hydroxyvitamin D; SE, standard error.