Table 1

Univariable GEE results (B; 95% CI) presenting significant associations* between BASMI linear (or its components) and clinical and demographic variables

Mobility measures where higher values represent worse mobilityMobility measures where higher values represent better mobility
BASMI linearTragus-to-wall distanceLateral spinal flexionCervical rotationAnterior lumbar flexionMaximal intermalleolar distance
Age0.02
(0.01 to 0.03)
−0.16
(−0.20 to −0.13)
−0.31
(−0.40 to −0.22)
−0.19
(−0.33 to −0.06)
Male gender−0.28
(−0.41 to −0.16)
0.84
(0.61 to 1.06)
1.99
(1.39 to 2.59)
1.81
(0.12 to 3.50)
7.44
(4.93 to 9.94)
Education†−0.39
(−0.52 to −0.26)
−0.34
(−0.59 to −0.09)
1.52
(0.90 to 2.14)
4.84
(3.08 to 6.59)
8.24
(5.59 to 10.90)
BMI−0.01
(−0.03 to 0.00)
0.06
(0.03 to 0.08)
0.05
(0.03 to 0.07)
HLA-B27 positive−0.27
(−0.40 to −0.14)
3.41
(1.68 to 5.13)
6.51
(3.86 to 9.17)
Symptom duration−0.24
(−0.31 to −0.18)
0.03
(0.01 to 0.05)
0.38
(0.13 to 0.64)
Currently employed0.18
(0.05 to 0.32)
Current arthritis−2.42
(−4.24 to −0.61)
−0.16
(−0.31 to 0.00)
ASDAS-CRP0.16
(0.13 to 0.19)
0.12
(0.05 to 0.18)
−0.54
(−0.67 to −0.40)
−1.89
(−2.41 to −1.37)
−0.12
(−0.16 to −0.08)
−2.56
(−3.13 to −1.98)
Enthesitis score0.02
(0.01 to 0.03)
−0.09
(−0.12 to −0.06)
−0.37
(−0.46 to −0.27)
−0.41
(−0.56 to −0.26)
mSASSS0.07
(0.03 to 0.10)
0.17
(0.06 to 0.28)
−0.28
(−0.39 to −0.17)
−0.98
(−1.51 to −0.46)
BASRI-hips0.52
(0.23 to 0.82)
MRI inflammation score (spine)0.15
(0.08 to 0.23)
0.36
(0.13 to 0.58)
−0.63
(−0.91 to −0.34)
−1.43
(−2.18 to −0.64)
−0.12
(−0.19 to −0.05)
MRI inflammation score (SIJ)0.07
(0.02 to 0.12)
NSAID intake in the last 6 months0.09
(0.04 to 0.15)
cDMARD intake in the last 6 months−2.04
(−3.67 to −0.40)
  • *Only associations with a p value<0.05 are presented (for the full set of univariable results, see online supplemental table 2).

  • †Education at baseline (university or equivalent).

  • BASRI-hips was only considered for BASMI linear and for maximal intermalleolar distance.

  • ASDAS-CRP, Ankylosing Spondylitis Disease Activity Score C reactive protein; BASMI, Bath Ankylosing Spondylitis Metrology Index; BASRI-hips, Bath Ankylosing Spondylitis Radiology Index for the hips; BMI, body mass index; cDMARD, conventional disease-modifying antirheumatic drugs; GEE, generalised estimating equations; HLA-B27, human leucocyte antigen B27; mSASSS, Modified Stoke Ankylosing Spondylitis Spinal Score; NSAID, nonsteroidal anti-inflammatory drugs; SIJ, sacroiliac joint.