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Table 1 Baseline descriptive data for the two study populations.

From: Responsiveness and minimal clinically important difference for pain and disability instruments in low back pain patients

  Study population
Characteristic Primary sector patients (n = 94) Secondary sector patients (n = 97)
Age, mean (min., max.) 44 (18–76) 47 (20–85)
Sex, n (%)   
   Male 44 (47) 45 (46)
   Female 50 (53) 52 (54)
Pain location, n (%)   
   Low back only* 70 (75) 28 (29)
   Leg pain (+/- LBP) 24 (25) 69 (71)
Duration of current problem, n (%)   
   ≤ 30 days 69 (73) 12 (12)
   > 30 days 23 (24) 79 (81)
   Missing 2 (2) 6 (6)
Use of pain medication†, n (%)   
   ≤ a couple of times a week 59 (63) 39 (40)
   > a couple of times a week 33 (35) 58 (60)
   Missing 2 (2) -
Disability at baseline 0–100 scale, mean (SD)   
   ODI 27.4 (16.2) 33.7 (14.5) ‡
   RMQ 40.3 (18.5) 45.2 (16.3)
   LBPRSdisability 33.6 (17.8) 45.2 (17.8) ‡
   SF36 (pf) 34.9 (25.0) 45.7 (20.3) ‡
Pain at baseline, 0–100 scale (mean, SD)   
   LBPRSpain 37.4 (21.1) 47.7 (22.5) ‡
   SF36 (bp) 64.9 (20.2) 64.0 (20.5)
   NRSpain over the past week 43.3 (23.2) 48.6 (25.3)
  1. * The low back is defined as the area between the lower costal margin and the gluteal folds.
  2. † Any pain-killing medication taken for back and/or leg pain over the past week.
  3. ‡ Significant different compared to primary sector patients (unpaired t-test)