BASDAI is scored on a scale of 1–10 and is an average of six questions covering discomfort, pain and fatigue measured on a VAS of 0–10 (0=none, 10=very severe).

BASFI is a mean score of 10 questions measured on a VAS of 0–10 (0=easy, 10=impossible) assessing patients' ability to complete normal daily activities or physically demanding activities.

The WPAI scores are presented for those patients who were working.

BASMI is scored on a scale of 0–10 and comprises five measures scored 0–2 (0=normal mobility, 2=severe reduction): cervical rotation, intermalleolar distance, modified Schober's test, lateral flexion and tragus-to-wall distance.

ASDAS, Ankylosing Spondylitis Disease Activity Score; ASspiMRI, Ankylosing Spondylitis spine MRI; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; BASFI, Bath Ankylosing Spondylitis Functional Index; BASMI, Bath Ankylosing Spondylitis Metrology Index; Berlin score, Berlin modified ASspiMRI score; BMI, body mass index; csDMARD, conventional synthetic disease-modifying antirheumatic drug; FACIT-F, Functional Assessment of Chronic Illness Therapy-Fatigue; HLA-B27, human leucocyte antigen B27; hsCRP, high-sensitivity C reactive protein; IBD, inflammatory bowel disease; MCS, mental component summary; NSAID, non-steroidal anti-inflammatory drug; PCS, physical component summary; SF-36, short-form 36 health survey; SI, sacroiliac; SPARCC, SPondyloArthritis Research Consortium of Canada; ULN, upper limit of normal; VAS, Visual Analogue Scale; WPAI, Work Productivity and Activity Impairment.