Table 3.

The Position of Center of Mass in Both Groups

		NBP Group	LBP Group	P	95% CI		Cohen’s d
		Mean±SD	Mean±SD		Lower	Upper
Anterior- Posterior (m)	FC	−1.46±0.20	−1.43±0.18	0.516	−0.125	0.064	0.16
	TO	−0.99±0.16	−0.94±0.12	0.168	−0.049	0.035	0.35
	HE	−0.65±0.13	−0.63±0.12	0.599	−0.077	0.045	0.13
	KF	−0.37±0.09	−0.36±0.09	0.449	−0.017	0.023	0.19
	BI	−0.17±0.08	−0.17±0.09	0.849	0.004	0.022	−0.05
	HF	0.15±0.15	0.16±0.14	0.979	−0.001	0.036	0.01
Lateral (m)	FC	0.92±0.22	0.98±0.23	0.266	−0.064	0.057	0.28
	TO	−0.17±0.17	0.77±0.16	0.426	−0.033	0.042	5.65
	HE	0.62±0.14	0.65±0.13	0.412	−0.095	0.039	0.21
	KF	0.53±0.11	0.55±0.11	0.426	−0.023	0.028	0.20
	BI	0.48±0.10	0.51±0.11	0.422	−0.021	0.026	0.20
	HF	0.46±0.10	0.47±0.13	0.972	−0.001	0.030	0.01
Vertical (m)	FC	0.85±0.05	0.85±0.05	0.968	0.000	0.012	−0.01
	TO	0.88±0.05	0.88±0.05	0.877	0.002	0.012	−0.04
	HE	0.86±0.05	0.86±0.05	0.906	0.001	0.012	−0.03
	KF	0.80±0.05	0.79±0.05	0.755	0.004	0.012	−0.08
	BI	0.81±0.05	0.81±0.05	0.726	0.004	0.013	−0.09
	HF	0.92±0.09	0.89±0.09	0.171	0.032	0.023	−0.35

Notes: The positive/negative values denote the anterior/posterior, support/kick-side, and upper/lower position of center of mass, respectively.

Abbreviations: LBP, low back pain group; NBP, no low back pain group; FC, foot contact; TO, toe-off; HE, maximum hip extension; KF, maximum knee flexion; BI, ball impact; HF, maximum hip flexion; 95% CI, 95% confidence interval for difference.