Table 1 Characteristics for participants (adults and adolescents)
From: Are MRI-defined fat infiltrations in the multifidus muscles associated with low back pain?
| Â | Adults | Adolescents | ||||
|---|---|---|---|---|---|---|
| Â | Â | Â | Men | Women | Â | Â |
Variables | n | (%) | (%) | (%) | n | (%) |
Sex | Â | Â | Â | Â | Â | Â |
   Male | 199 | (48) | -- | -- | 205 | (47) |
   Female | 213 | (52) | -- | -- | 234 | (53) |
LBP variables | Â | Â | Â | Â | Â | Â |
   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 | Â | Â | Â | Â | Â | Â |
   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 | Â | Â | Â | Â | Â | Â |
   Normal | 234 | (57) | (46) | (68) | 369 | (84) |
   Overweight | 131 | (32) | (47) | (18) | 56 | (13) |
   Obese | 44 | (11) | (8) | (14) | 11 | (3) |
Workload | Â | Â | Â | Â | Â | Â |
   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 | Â | Â | Â | Â | Â | Â |
   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 | Â | Â | Â | Â | Â | Â |
   <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 | Â | Â | Â | Â | Â | Â |
   Not every day | -- | -- | -- | -- | 66 | (15) |
   Every day | -- | -- | -- | -- | 370 | (85) |