Comparison between clusters A and B in DESIR and Be-Giant cohorts at baseline and during follow-up

ASDAS: Ankylosing Spondylitis Disease Activity Score; BASG: Bath Ankylosing Spondylitis Global Score; bDMARD: biologic DMARD; cDMARD: conventional DMARD; MSASSS: Modified Stoke Ankylosing Spondylitis Spinal Score; PDUS: power Doppler ultrasound; SPARCC: Spondyloarthritis Research Consortium of Canada.