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. 2011 May 19;342:d2786. doi: 10.1136/bmj.d2786

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© Hellum et al 2011

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-commercial License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited, the use is non commercial and is otherwise in compliance with the license. See: http://creativecommons.org/licenses/by-nc/2.0/ and http://creativecommons.org/licenses/by-nc/2.0/legalcode.

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graphic file with name helc798710.f2_default.jpg — Fig 2 Primary outcome variable within intention to treat mixed model analysis. Mean difference in Oswestry disability index (ODI) was 6.9 points at two year follow-up, P<0.001 (adjusted for baseline index)