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Table 1 Characteristics for participants (adults and adolescents)

From: Are MRI-defined fat infiltrations in the multifidus muscles associated with low back pain?

  Adults Adolescents
    Men Women   
Variables n (%) (%) (%) n (%)
Sex       
   Male 199 (48) -- -- 205 (47)
   Female 213 (52) -- -- 234 (53)
LBP variables       
   LBP month -- --    98 (22)
   LBP year 289 (70) (70) (70) 182 (41)
   LBP ever 352 (85) (85) (85) -- --
Fat infiltration in LMM in at least one level       
   Grade 0 (none) 78 (19) (29) (10) 379 (86)
   Grade 1 (slight) 293 (71) (63) (79) 60 (14)
   Grade 2 (severe) 41 (10) (9) (11) 0 (0)
Body weight       
   Normal 234 (57) (46) (68) 369 (84)
   Overweight 131 (32) (47) (18) 56 (13)
   Obese 44 (11) (8) (14) 11 (3)
Workload       
   Sedentary 89 (22) (20) (24) -- --
   Sedentary/walking 144 (35) (30) (40) -- --
   Light physical 92 (22) (19) (26) -- --
   Heavy physical 84 (21) (31) (11) -- --
Physical activity       
   Not active 59 (14) (12) (17) -- --
   Walking/cycling >4 hours 204 (50) (48) (51) -- --
   Active sports >3 hours 140 (34) (38) (31) -- --
   Competitive sports 9 (2) (3) (2) -- --
Weekly hours of sports activity       
   <2 91 (22) (27) (18) 117 (27)
   2 – 4 107 (26) (23) (29) 120 (27)
   4 – 6 103 (25) (24) (26) 97 (22)
   >6 111 (27) (27) (27) 92 (19)
Daily bicycling       
   Not every day -- -- -- -- 66 (15)
   Every day -- -- -- -- 370 (85)
  1. LBP, lower back pain; LMM, lumbar multifidus muscles.