Table 1.

The demographic and clinical characteristics of patients at diagnosis. Values are % unless otherwise specified.

VariableValue
Female/male, n11/61
Age at symptom onset, yrs, mean ± SD12 ± 2.7
Age at diagnosis, yrs, median (interquartile range)14 (11.5–16)
Family history of AS27.8
HLA-B2759.4
ESR, mm/h, mean ± SD38.5 ± 29
Initial BMI category
  Healthy BMI72.2
  Increased BMI27.8
Enthesitis63.8
Sacroiliitis45.8
Ankle involvement43
Hip involvement33.3
Knee involvement23.6
Tarsitis26.4
Anterior uveitis6.8

  • AS: ankylosing spondylitis; ESR: erythrocyte sedimentation rate; BMI: body mass index.