• Steven J Kamper, Christopher G Maher, Robert D Herbert, Mark J Hancock, Julia M Hush, and Robert J Smeets.
• The George Institute for International Health, University of Sydney, PO Box M201, Missenden Rd, Camperdown, NSW 2050, Australia. skamper@george.org.au
• Eur Spine J. 2010 Sep 1;19(9):1495-501.

AbstractEpidemiological and clinical studies of people with low back pain (LBP) commonly measure the incidence of recovery. The pain numerical rating scale (NRS), scores from 0 to 10, and Roland Morris disability questionnaire (RMDQ), scores from 0 to 24, are two instruments often used to define recovery. On both scales higher scores indicate greater severity. There is no consensus, however, on the cutoff scores on these scales that classify people as having recovered. The aim of this study was to determine which cutoff scores most accurately classify those who had recovered from LBP. Subjects from four clinical studies were categorized as 'recovered' or 'unrecovered' according to their self-rating on a global perceived effect scale. Odd ratios were calculated for scores of 0, 1, 2, 3 and 4 on the NRS and RMDQ to predict perceived recovery. Scores of 0 on the NRS and

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