Table 3.

Concurrent validity of postural stability

	Pain				Fear of pain		Function				Muscular conditioning
	Mean pain during the last week		SF-36 bodily pain		FABQ-pa		Roland Morris Questionnaire		SF-36 physical functioning		Maximal oxygen uptake		Back muscle endurance
At inclusion
n	92		95		91		94		96		92		96
mVel EC, mm/s	0.15	p = 0.15	−0.24	p = 0.02	0.09	p = 0.40	0.25	p = 0.01	−0.25	p = 0.01	−0.43	p < 0.01	−0.25	p = 0.02
APdispl, mm	0.03	p = 0.76	−0.09	p = 0.39	−0.11	p = 0.31	−0.07	p = 0.53	−0.17	p = 0.09	0.01	p = 0.94	−0.10	p = 0.34
RRvel	0.09	p = 0.41	−0.17	p = 0.11	−0.07	p = 0.50	0.04	p = 0.71	−0.06	p = 0.57	−0.13	p = 0.23	−0.16	p = 0.13
Normalised mVel EC	0.23	p = 0.02	−0.30	p < 0.01	0.02	p = 0.82	0.24	p = 0.02	−0.33	p < 0.01	−0.13	p = 0.23	−0.18	p = 0.08
Normalised APdispl	0.02	p = 0.82	−0.03	p = 0.81	−0.02	p = 0.89	−0.07	p = 0.50	−0.07	p = 0.52	−0.03	p = 0.75	−0.07	p = 0.47
Normalised RRvel	0.08	p = 0.48	−0.17	p = 0.10	−0.14	p = 0.20	0.01	p = 0.89	−0.09	p = 0.36	−0.05	p = 0.62	−0.11	p = 0.29
Change from inclusion to follow−up
n	90		94		89		93		93		84		93
mVel EC, mm/sec	0.18	p = 0.08	−0.15	p = 0.16	−0.05	p = 0.65	0.03	p = 0.80	−0.16	p = 0.14	−0.02	p = 0.85	−0.01	p = 0.91
APdispl, mm	0.05	p = 0.66	−0.02	p = 0.83	−0.19	p = 0.07	0.04	p = 0.70	−0.15	p = 0.16	−0.19	p = 0.09	−0.11	p = 0.32
RRvel	0.03	p = 0.81	−0.06	p = 0.55	−0.04	p = 0.74	−0.09	p = 0.39	0.13	p = 0.20	0.07	p = 0.54	0.04	p = 0.72
Normalised mVel EC	0.20	p = 0.06	−0.16	p = 0.12	−0.07	p = 0.51	0.02	p = 0.83	−0.15	p = 0.15	−0.04	p = 0.70	−0.01	p = 0.95
Normalised APdispl	−0.03	p = 0.81	−0.03	p = 0.81	−0.21	p = 0.04	0.04	p = 0.71	−0.15	p = 0.14	0.19	p = 0.09	0.09	p = 0.38
Normalised RRvel	0.06	p = 0.57	−0.07	p = 0.49	−0.05	p = 0.64	−0.04	p = 0.70	0.12	p = 0.24	−0.05	p = 0.66	0.03	p = 0.77

Correlation (r) to LBP-relevant measures and physical tests, non-normalised and normalised data

FABQ-pa Fear Avoidance Believes Questionnaire-physical activity