Variables Associated with Performance of an Active Limb Movement following Within-Session Instruction in People with and People without Low Back Pain

Table 2

Pearson product-moment correlations between the relative motion index (RMI) during the active-instructed condition and subject characteristics, clinical findings, and laboratory findings.

	RMI, active-instructed condition
	People with LBP		People without LBP
	Correlations	P value	Correlations	P value
Gender	0.570	0.027	0.273	0.244
Age	−0.115	0.682	−0.120	0.613
Weight	−0.164	0.560	−0.318	0.171
Height	−0.393	0.149	−0.307	0.188
Spine length	−0.457	0.087	−0.295	0.206
Shank length	−0.251	0.368	−0.445	0.049
Passive hip lateral rotation*	0.028	0.922	0.030	0.900
Femoral anteversion†	0.022	0.943	0.191	0.420
Generalized joint hypermobility‡	0.242	0.384	0.087	0.715
RMI§, passive condition	0.873	<0.001	0.144	0.544
RMI, active condition	0.654	0.008	0.229	0.331

Abbreviations: HLR, hip lateral rotation; RMI, relative motion index.
Significant correlations indicated in bold-face type.
∗Passive hip lateral rotation with pelvis stabilized, measured in prone with an inclinometer.
†Femoral anteversion measured with a goniometer using methods described by Ruwe et al. [37].
‡Generalized joint hypermobility measured with Beighton Hypermobility Scale [38].
§Relative motion index calculated as the amount of HLR angular motion completed prior to the start of lumbopelvic motion.