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LB Leif Brunvand
DF Drude Fugelseth
KS Knut Håkon Stensaeth
KD Knut Dahl-Jørgensen
HM Hanna Dis Margeirsdottir
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Demographic and clinical data are presented as percentages or means with their standard deviations. Means were compared with student’s t-test when the data was normally distributed, otherwise with Mann–Whitney U test. The participants were stratified with respect to BMI into three different groups; group I (levels <25 centile), group II (levels between 25–75 centile) and group III (levels >75 centile). The differences within the stratified groups were tested with student’s t- test or Mann–Whitney U test. Correlation was tested with Pearson’s linear regression method.

Copyright and License information: The Author(s). ©2016
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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