Table 1

 Patient characteristics of the OASIS cohort at baseline (n = 199)

VariableMeanSDMedian25th Centile75th CentileMinMax
OASIS, Outcome in Ankylosing Spondylitis International Study; mSASSS, modified Stoke Ankylosing Spondylitis Spinal Score; BASMI, Bath Ankylosing Spondylitis Metrology Index; SD, standard deviation.
Age (years)43.712.743.133.452.919.078.0
Duration of complaints (years)20.111.717.111.727.10.052.5
Duration of disease after diagnosis (years)
Male (%)71
Radiographic changes, mSASSS (units)
Spinal mobility measures
    Chest expansion (cm)
    Finger to floor distance (cm)14.213.512.
    Occiput to wall distance (cm)
    Tragus to wall distance (cm)14.14.412.511.
    Modified Schober (cm)
    Lateral spinal flexion (cm)11.25.710.96.415.31.226.1
    Cervical rotation (degrees)
    Intermalleolar distance (cm)105.021.7105.194.0119.038.0152.0