Fig. 1

Pain thresholds to electrical stimulation in control areas (mean values recorded in trapezius, deltoid and quadriceps muscles and overlying subcutis and skin) in patients with high frequency episodic migraine (n. 41)(M1), chronic migraine (n.40)(M2), fibromyalgia (FMS)(n.40), fibromyalgia plus high frequency episodic migraine (n.42)(FMS + M1), fibromyalgia + chronic migraine (n.40)(FMS + M2)(Means ± SD). * = p < 0.05; ** = p < 0.01; *** = p < 0.001. 1-way ANOVA = significant trend for the three tissues, ***. Internal comparisons = for skin, M1 vs M2: **; M1 vs FMS, FMS + M1, FMS + M2: ***; M2 vs FMS, FMS + M1, FMS + M2: ***; FMS vs FMS + M1: *; FMS vs FMS + M2: ***; FMS + M1 vs FMS + M2: * for subcutis, M1 vs M2: *; M1 vs FMS, FMS + M1, FMS + M2: ***; M2 vs FMS, FMS + M1, FMS + M2: ***; FMS vs FMS + M2: *** for muscle, M1 vs M2: *; M1 vs FMS, FMS + M1, FMS + M2: ***; M2 vs FMS, FMS + M1, FMS + M2: ***; FMS vs FMS + M2: ***