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Table 2 Descriptives on demographic variables, pain measurements, rate of perceived exertion and amount of assisted weight during the exercise. All values, expect sex and symptom site, are expressed by median and range. (HC = healthy controls; RLBP = recurrent low back pain; ncCLBP = non-continuous chronic low back pain; cCLBP = continuous chronic low back pain; BMI = body mass index; NRS = numeric rating scale; RMDQ = Roland Morris Disability Questionnaire; RPE = rate of perceived exertion; n = number; m = male; f = female; L = left; R = right; Bi = bilateral)

From: Differences in myoelectric activity of the lumbar muscles between recurrent and chronic low back pain: a cross-sectional study

  HC (n = 21) RLBP (n = 23) ncCLBP (n = 15) cCLBP(n = 16)
Age (years) 40 [20–55] 27 [21–53] 31 [20–45] 50 [23–64]
BMI (kg/m²) 23 [18–30] 23 [19,20,21,22,23,24,25,26,27,28,29] 23 [20,21,22,23,24,25,26] 24 [20–32]
Sex m = 9(43 %), f = 12(57 %) m = 9(39 %), f = 14(61 %) m = 7(47 %), f = 8(53 %) m = 8(50 %), f = 8(50 %)
Symptom site   L = 2(9 %), R = 4(17 %), Bi = 17(74 %) R = 1(7 %), Bi = 14(93 %) L = 2(13 %), R = 2(13 %, Bi = 12(74 %)
Duration of LBP (months)   112 104 198
Disability (RMDQ) 0 [0–2] 1 [0–6] 5 [1,2,3,4,5,6,7,8,9,10,11] 5 [1,2,3,4,5,6,7,8,9,10,11,12]
Pain before exercise (NRS) 0 [0–0] 0 [0–1] 1 [0–7] 3 [0–8]
Pain during exercise (NRS) 0 [0–3] 1 [0–6 ] 3 [0–6] 3 [0–8]
Pain after exercise (NRS) 0 [0–2] 1 [0–4] 2 [0–5] 2 [0–8]
Pain expected pain (NRS) 1 [0–4] 2 [0–5] 3 [0–6] 3 [1,2,3,4,5,6,7,8]
RPE (Borg) 9 [6,7,8,9,10,11,12,13,14] 9 [6,7,8,9,10,11,12,13] 11 [7,8,9,10,11,12,13] 11 [6,7,8,9,10,11,12,13,14,15]
Assisted weight -18 [-26- -15] -20 [-30 - -13] -21 [-25 - -13] -22 [-35 - -15]