CRP and COVID-19: Compared with post COVID-19 wave phases, both numbers of ASDAS-ESR and ASDAS-CRP score increased from < 1.3 to ≥ 1.3 more than decreased from ≥ 1.3 to < 1.3 (15 vs. 7; 18 vs. 13) in pre COVID-19 period; (19 vs. 7; 10 vs. 9) during COVID-19 period (Table 5).