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Table 1 Characteristics of groups dependent on RLS criteria status*

From: Increased nocturnal periodic limb movements in rheumatoid arthritis patients meeting questionnaire diagnostic criteria for restless legs syndrome

Variable RLS- (SD) [n = 34] RLS + (SD) [n = 23] Significance
Age (years) 54.76 (15.90) 55.65 (13.59) 0.809
Gender [Males: Females] 6:28 3:20 0.468
BMI 27.67 (6.15) 31.25 (8.53) 0.094
VAS pain (cm) 3.34 (2.07) 3.87 (2.24) 0.334
RADAI 2.96 (2.00) 3.66 (2.21) 0.197
PSQI 5.97 (3.47) 9.59 (3.11) <0.001
ESS 7.42 (4.70) 7.87 (4.02) 0.682
Hemoglobin [g/L] 132.50 (15.38) 136.33 (10.07) 0.418
Ferritin [μg/L] 109.42 (118.67) 103.21 (111.17) 0.818
Iron [μmol/L] 15.44 (7.75) 16.43 (6.62) 0.568
C-reactive protein [mg/L] 6.09 (6.72) 4.02 (6.17) 0.144
Parity in female participants 2.37 (2.42) 1.00 (1.22) 0.071
Duration of RA diagnosis (years) 10.91 (9.38) 14.83 (12.11) 0.225
  1. *Mean values provided for non-categorical data; RLS: restless legs syndrome; SD:standard deviation; BMI: body mass index (kilograms/metre2); VAS: visual analogue scale; cm: centimetres; RADAI: rheumatoid arthritis disease activity index; PSQI: Pittsburgh sleep quality index; ESS: Epworth Sleepiness Scale; g: grams; L: litre; μg: microgram; μmol: micromole; mg: milligram.