Table 5.

Within-subject analysis of morphologic features in deep multifidus muscle in cLBP.

	Painful side	Nonpainful side	t-value	P-value
Resting thickness	1.66 ± 0.25	1.67 ± 0.21	−0.23	0.82
Thickness during MIVC	2.17 ± 0.37	2.16 ± 0.36	0.15	0.89
Thickness change (%)	30.79 ± 9.10	29.36 ± 12.78	0.51	0.62
Cross-sectional area	2.81 ± 0.81	2.85 ± 0.74	−0.4	0.69

cLBP, chronic low back pain; MVIC, maximum voluntary isometric contraction.