Het kan wel eens zijn dat de verbetering op de ASA score niet goed genoeg is.
ASAS 20:
In 2001, the ASAS developed new outcome measures and recommended their use in trials of symptom-modifying therapy.12 The ASAS 20 improvement criteria summarize changes in four domains: physical function, pain, patient global assessment, and inflammation. A positive response is defined as 20% or greater improvement and a net improvement of one unit on a ten-unit scale, in each of three domains, with no worsening in the fourth. An ASAS 40 response is defined as =40% improvement of at least two units in each of three domains, with no worsening in the fourth. Other outcome measures include: ASAS Partial Remission (PR), defined as a score less than two units in each domain, and ASAS 5/6, defined as 20% improvement in five of six domains, adding C-reactive protein and lateral vertebral flexion. More recently, the ASAS, by analogy to rheumatoid arthritis, validated the Ankylosing Spondylitis Disease Activity Score13 (ASDAS), which includes C-reactive protein and some questions from the BASDAI. This score showed a highly discriminatory capacity for assessing disease activity in AS.
bron:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5045114/
er missen dus data schat ik in. er wordt alleen gerapporteerd wie er meer dan 20% verbetering heeft.