KNG1 and fibromyalgia: However, in our study, we did not find a significant association between KNG1 levels and fibromyalgia when we compared ME/CFS patients with fibromyalgia (n = 20) and ME/CFS without fibromyalgia (n = 19) using the Wilcoxon rank-sum test (z-score = 0.126, p-value = 0.899).