Table 1.

Baseline demographics (Background data)

	FM (n = 51)	Control (n = 31)	p-value
Age (years)
Mean (SD)	45.1 (12.7)	46.0 (11.7)	0.785
Median [Min, Max]	47.0 [18.0, 66.0]	49.0 [22.0, 61.0]
BMI
Mean (SD)	28.2 (5.87)	24.7 (3.27)	0.008
Median [Min, Max]	27.4 [18.6, 45.4]	24.5 [19.1, 32.2]
Missing	3 (5.9 %)	2 (6.5 %)
Smoking
Yes	12 (23.5 %)	2 (6.5 %)	0.091
No	39 (76.5 %)	29 (93.5 %)
Other medical diagnoses
Mean (SD)	1.98 (1.75)	0.452 (0.675)	< 0.001
Median [Min, Max]	2.00 [0, 7.00]	0 [0, 2.00]
Any daily systemic medication
Yes	40 (78.4 %)	7 (22.6 %)	< 0.001
No	11 (21.6 %)	24 (77.4 %)
Leisure time activity
Inactive	31 (60.8 %)	15 (48.4 %)	0.386
Active	20 (39.2 %)	16 (51.6 %)
Mean pain intensity previous week (NRS 0–10)
Mean (SD)	5.29 (1.89)	1.65 (1.96)	< 0.001
Median [Min, Max]	6.00 [1.00, 9.00]	1.00 [0, 8.00]
Highest pain intensity previous week (NRS 0–10)
Mean (SD)	7.34 (1.59)	3.03 (2.23)	< 0.001
Median [Min, Max]	7.75 [3.00, 10.0]	3.00 [0, 8.00]
Missing	1 (2.0 %)	0 (0 %)
Lowest pain intensity previous week (NRS 0–10)
Mean (SD)	2.91 (1.87)	0.903 (1.62)	< 0.001
Median [Min, Max]	3.00 [0, 7.00]	0 [0, 6.00]
Missing	1 (2.0 %)	0 (0 %)
Sleep problems
Yes	40 (78.4 %)	3 (9.7 %)	< 0.001
No	11 (21.6 %)	28 (90.3 %)

FM Fibromyalgia patients, BMI Body Mass Index, p-value: Mann-Whitney U test for continuous variables or Chi-squared test for categorical variables, SD standard deviation