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Table 1 Baseline demographics (Background data)

From: Muscle activity and acute stress in fibromyalgia

  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 %)  
  1. 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