TY - JOUR T1 - Reference intervals of spinal mobility measures in normal individuals: the mobility study JF - Annals of the Rheumatic Diseases JO - Ann Rheum Dis SP - 1218 LP - 1224 DO - 10.1136/annrheumdis-2013-204953 VL - 74 IS - 6 AU - Sofia Ramiro AU - Astrid van Tubergen AU - Carmen Stolwijk AU - Désirée van der Heijde AU - Patrick Royston AU - Robert Landewé Y1 - 2015/06/01 UR - http://ard.bmj.com/content/74/6/1218.abstract N2 - Objectives To establish reference intervals (RIs) for spinal mobility measures as recommended for patients with axial spondyloarthritis, and to determine the effect of age, height and gender on spinal mobility, in normal individuals.Methods A cross-sectional study (MOBILITY) was conducted among normal individuals aged 20–69 years. Recruitment was stratified by gender, age (10-year categories) and height (10 cm categories). Eleven spinal mobility measures were assessed. Age specific RIs and percentiles were derived for each measure.Results 393 volunteers were included. All spinal mobility measures decreased with increasing age. Therefore, age specific RIs were developed. The 95% RIs (2.5th and 97.5th percentiles), as well as the 5th, 10th, 25th, 50th, 75th and 90th percentiles for each spinal mobility measure and different ages are presented. Mobility percentile curves were also plotted for each of the measures. For instance, the 95% RI for lateral spinal flexion was 16.2–28.0 cm for a 25-year-old subject, 13.2–25.0 cm for a 45-year-old subject and 10.1–21.9 cm for a 65-year-old subject. After adjustment for age, there was no need for gender specific RIs, while RIs of some measures are height-adjusted.Conclusions Age specific RIs and percentiles were derived for each of the spinal mobility measures for normal individuals. These may guide clinicians when assessing the mobility of patients with axial spondyloarthritis. The RIs may serve as cut-off levels for ‘normal’ versus ‘abnormal’, whereas the mobility percentile curves may be used to assess the level of mobility of patients with axial spondyloarthritis. ER -