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. 2020 Mar 4;10(3):e032567. doi: 10.1136/bmjopen-2019-032567

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Bar graph of age variation in serum 25(OH)D levels in study population (n=30 023). Bar graph showing age variation in serum 25(OH)D levels (nmol/L) of 30 023 patients at Royal Melbourne Hospital, Victoria, Australia between 2014 and 2017. 25(OH)D levels increased with age, and patients≥50 years had significantly higher mean 25(OH)D concentrations compared with patients aged 20–29 years. Error bars represent SEM. Statistical significance of p values: p<0.05; *p<0.01; **p<0.001; ***p<0.0001.