Lumbar segmental instability: a criterion-related validity study of manual therapy assessment

Table 1 Description of the R/CLBP 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
Proportion not working due to LBP	.12	.331	-	105
Delay between clinical examination and radiography (days)	5	5	-1 – 22	128

Notes: R/CLBP = recurrent or chronic low back pain. sd = Standard deviation; N = number with complete data. Disability score was assessed on the modified Roland-Morris RM18 [57]; Pain level was self-rated on a horizontal 10 cm visual analog scale.

ISSN: 1471-2474