Table 2.

Preliminary questionnaire data (Psychological questionnaires)

	FM (n = 51)	Control (n = 31)	p-value
ACR2016 symptom severity scale
Mean (SD)	8.12 (2.44)	2.35 (1.56)	< 0.001
Median [Min, Max]	8.00 [4.00, 12.0]	3.00 [0, 6.00]
ACR2016 widespread pain index
Mean (SD)	11.3 (4.19)	1.48 (1.77)	< 0.001
Median [Min, Max]	11.0 [4.00, 19.0]	1.00 [0, 8.00]
FIQ score
Mean (SD)	44.2 (14.8)	15.3 (5.48)	< 0.001
Median [Min, Max]	47.3 [8.57, 70.1]	13.2 [10.0, 32.3]
Missing	1 (2.0 %)	0 (0 %)
PCS score
Mean (SD)	17.6 (10.2)	2.65 (3.56)	< 0.001
Median [Min, Max]	16.0 [0, 48.0]	1.00 [0, 13.0]
PSS score
Mean (SD)	19.5 (7.74)	7.74 (4.15)	< 0.001
Median [Min, Max]	20.0 [3.00, 35.0]	7.00 [2.00, 19.0]
Missing	1 (2.0 %)	0 (0 %)
STAI-A score
Mean (SD)	40.7 (9.85)	29.2 (3.81)	< 0.001
Median [Min, Max]	39.0 [27.0, 73.0]	29.0 [23.0, 38.0]
STAI-B score
Mean (SD)	45.0 (9.68)	28.3 (5.27)	< 0.001
Median [Min, Max]	46.0 [25.0, 64.0]	27.0 [21.0, 44.0]
Missing	3 (5.9 %)	1 (3.2 %)

FM Fibromyalgia patients, p-value: Mann-Whitney U test, ACR2016 American College of Rheumatology 2016 modified diagnostic criteria, FIQ Fibromyalgia Impact Questionnaire, PCS Pain Catastrophizing Scale, PSS Perceived Stress Scale, STAI-A State-Trait Anxiety Inventory A (State Anxiety), STAI-B State-Trait Anxiety Inventory B (Trait Anxiety), SD standard deviation