Lumbar segmental mobility disorders: comparison of two methods of defining abnormal displacement kinematics in a cohort of patients with non-specific mechanical low back pain

Table 4 Description of the RCLBP cohort

	Mean	sd	Range	N
Age	40.0	11.2	20–75	106
Body mass index	26.7	4.75	19.8–43.0	85
Years since first LBP episode	8.3	8.0	<1–33	104
Disability score (out of 18)	7.13	4.543	0 – 17	119
Pain level (out of 100)	42.7	25.7	0 – 100	117
Proportion with constant LBP	.23	.420	-	106

Notes: RCLBP = recurrent or chronic low back pain. sd = Standard deviation; N = number with complete data. Disability score was assessed on the modified Roland-Morris RM18 (Stratford et al. (1997); Pain level was patient-rated on a horizontal 10 cm visual analog scale.

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