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Table 4 Number of levels registered with fat (grade 1 or 2) in the multifidus muscles at pre-treatment in the two analysis- / treatment groups

From: Fat in the lumbar multifidus muscles - predictive value and change following disc prosthesis surgery and multidisciplinary rehabilitation in patients with chronic low back pain and degenerative disc: 2-year follow-up of a randomized trial

  Predictor analysis (n = 147) Analysis of change in fat infiltration (n = 126)
  Rehab (n = 64) Surgery (n = 83) Rehab (n = 63) Surgery (n = 63)
0 levels with fat (n / %) 31 (48.4) 36 (43.4) 30 (47.6) 29 (46.0)
1 level with fat (Gradea 1 or 2; n / %) 18 (28.1) 24 (28.9) 18 (28.6) 19 (30.2)
2 levels with fat (Gradea 1 or 2; n / %) 12 (18.8) 18 (21.7) 13 (20.6) 11 (17.5)
3 levels with fat (Gradea 1 or 2; n / %) 3 (4.7) 5 (6.0) 2 (3.2) 4 (6.3)
  1. aGrading according to the criteria by Kjaer et al [9] and Solgaard et al [31]: Grade 0: 0 or < 20% of total cross-section (left plus right side) contains fat, Grade 1: 20%–50% of cross-section (left plus right side) contains fat, Grade 2: >50% of cross-section (left plus right side) contains fat