Table 5.

Mean change in ISS by average low back pain during the past week.

Declined 3 categories	Declined 2 categories	Declined 1 category	Stayed the same	Improved 1 category	Improved 2 categories	Improved 3 categories
−6b, c	6a	1a, b	−2b, c	−8c	−16d	−24e
n = 2	n = 10	n = 85	n = 273	n = 203	n = 51	n = 10

Select the number that best describes your average low back pain during the past week. 0 = No pain; 10 = Worst possible pain (recoded so that 10 = 5, 7–9 = 4, 4–6 = 3, 1–3 = 2, and 0 = 1; based on Sheehan Disability Scale and the Flushing Questionnaire) (6 weeks-baseline).

Note: F (6, 627) = 58.39, P < .0001. Cells that share a superscript do not differ significantly from one another.