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. 2014 Mar 24;4(3):e004399. doi: 10.1136/bmjopen-2013-004399

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 3.0) 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 and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/3.0/

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Photoplethysmography (PPG) ratio of pulse amplitude for each 30 s time interval after cuff deflation to the baseline pulse amplitude divided by the corresponding ratio in the control finger in participants with normal body mass index (BMI), overweight (25 kg/m²≤BMI<30 kg/m²) and obesity (BMI≥30 kg/m²). Symbols are means and SE. Models are adjusted for sex, age, smoking, total cholesterol and blood glucose. *p<0.05, **p<0.01, ***p<0.001 versus lean participants. †p<0.05, ††p<0.01, versus lean participants.