Muscle | Contralateral to dominant hand, mean (SD) (95% CI) | Ipsilateral to dominant hand, mean (SD) (95% CI) | ||
Asymptomatic | LBP | Asymptomatic | LBP | |
Muscle CSA* | ||||
Quadratus lumborum | 8.61 (2.09) (7.61 to 9.62) | 8.67 (2.44) (7.50 to 9.84) | 9.10 (2.19) (8.05 to 10.15) | 9.44 (2.56) (8.22 to 10.67) |
Multifidus + lumbar erector spinae | 26.7 (5.07) (24.3 to 29.1) | 28.2 (5.92) (25.3 to 31.0) | 27.4 (5.86) (24.6 to 30.2) | 30.4 (6.85) (27.1 to 33.7) |
Psoas | 19.9 (4.48) (17.7 to 22.0) | 20.5 (5.23) (18.0 to 23.0) | 19.7 (2.84) (18.4 to 21.1) | 21.0 (3.32) (19.4 to 22.6) |
Muscle thickness | ||||
Internal oblique | 1.68 (0.35) (1.51 to 1.85) | 1.67 (0.41) (1.48 to 1.87) | 1.60 (0.33) (1.45 to 1.76) | 1.45 (0.39) (1.27 to 1.64) |
Transversus abdominis | 0.72 (0.20) (0.62 to 0.81) | 0.68 (0.23) (0.57 to 0.80) | 0.68 (0.22) (0.58 to 0.79) | 0.70 (0.2) (0.58 to 0.83) |
Slide of anterior abdominal fascia | 1.57 (0.72) (1.23 to 1.92) | 0.62 (0.85 (0.21 to 1.02) | 1.52 (0.60) (1.24 to 1.81) | 0.47 (0.70) (0.14 to 0.81) |
CSA, cross-sectional area; LPB, low back pain.
*Measurements in cm2, thickness and slide measurements in cm.
Means are marginal means, and are adjusted for age, height and weight.