LPO and Anxiety: LPO levels in plasma were also significantly associated to clinical parameters (r = 0.452, P<0.01 for VAS; r = 0.578, P<0.01 for FIQ total score; r = 0.410, P<0.01 for pain; r = 0.311, P<0.05 for fatigue; r = 0.397, P<0.01 for morning tiredness; r = 0.402, P<0.01 for stiffness; r = 0.433, P<0.01 for anxiety; r = 0.561, P<0.