CRP and major depressive disorder: CPAQ had strong correlations with anxiety (r = −0.60, p < 0.05), depression (r = −0.63, p < 0.05) and TSK (r = −0.69, p < 0.01), moderate correlations with BASFI (r = −0.54, p < 0.05) and pain intensity (r = −0.48, p < 0.05), and no significant correlations with disease duration (r = −0.04, p > 0.05), BASDAI (r = 0.02, p > 0.05), ASDAS-CRP (r = −0.14, p > 0.05), and CRP (r = −0.04, p > 0.05).